Pinite, Quartz

State Route 118 Bantam River bridge, Litchfield, Litchfield County, Connecticut, USA

Dark brown pinite pseudomorphs after cordierite in massive quartz. Former Trinity College collection #7231. Harold Moritz specimen.

Almandine

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Loose almandine porphyroblast.

Kyanite

Litchfield, Litchfield County, Connecticut, USA

Typical nearly pure mass of slightly radiating kyanite crystals. An old specimen, probably from the eastern part of town, or perhaps a piece of the 1600-pound Brace wrote about in 1816. Former Philadelphia Academy of Sciences Collection.

Magnesio-hornblende

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Radiating fans of black magnesio-hornblende (see TEM-EDS analysis in child photo) in a fine-grained, granular albite-quartz matrix overlying a coarse-grained quartz layer. Part of an amphibole gneiss layer in the Ratlum Mountain formation. Former John Schroder collection.

Pyrrhotite

Mount Prospect complex, Litchfield, Litchfield County, Connecticut, USA

Metallic grains of pyrrhotite, reportedly with intergrown pentlandite and chalcopyrite, interspersed in a black and white norite. Eric Quinter collection.

Muscovite (Var: Fuchsite)

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Streaks of emerald green fuchsite in muscovite-annite schist. EDXRF reveals 0.56% Cr oxide. The prevalence of this green mica near the mine shafts cut into barren schist suggests it was mistaken for copper ore.

Pinite, Quartz

State Route 118 Bantam River bridge, Litchfield, Litchfield County, Connecticut, USA

Pinite pseudomorph after cordierite in quartz. Former Trinity College collection #7231. Harold Moritz specimen.

Muscovite (Var: Damourite), Kyanite, Ilmenite, Fluorapatite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Boudin in schist containing quartz, ilmenite (black metallic), and kyanite (blue-white). Much of the kyanite is altered completely, or partially (outer surfaces) to damourite (yellowish-white). Some pale blue-green to yellow-green glassy fluorapatite is present, such as just below center in the quartz, and near the far right edge.

Muscovite (Var: Damourite), Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Damourite pseudomorphs after kyanite in quartz.

Actinolite, Grossular

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Roughly crystallized calc-silicate assemblage - pale green fibrous actinolite and pale orange grossular, exposed when calcite was naturally etched out.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Slab of "hornblende" gneiss in amphibolite. The particular amphibole species has not been characterized but is likely to be magnesio-hornblende based on analyses of similar crystals from an area north of this site.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Slab of amphibolite with good "hornblende" crystals. The particular amphibole species has not been characterized but is likely to be magnesio-hornblende based on analyses of similar crystals from an area north of this site.

Magnetite, Ilmenite, Chlorite Group, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Magnetite pseudomorph after ilmenite (it is strongly magnetic) in massive quartz with chlorite formed at the contact of discordant quartz mass with schist. Many of these undeformed "ilmenite" crystals are actually partly to completely replaced by magnetite, rutile, and/or hematite.

Magnetite, Hematite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Euhedral magnetite and hematite pseudomorph after ilmenite, in quartz. These very brittle crystals (note repairs to this one) formed at the contact between the host schist and semi-conformable, pure quartz masses that must have been initially open space for such perfect crystals to form.

Hematite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Partial hematite and rutile pseudomorph after ilmenite crystal in quartz.

Muscovite (Var: Damourite), Kyanite, Stilbite Subgroup

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up of damourite pseudomorphs after terminated kyanite crystals in a quartz/kyanite/ilmenite boudin in schist. Some white stilbite is also present at lower right.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Slab of "hornblende" gneiss. The particular amphibole species has not been characterized but is likely magnesio-hornblende based on analyses of other Connecticut amphibole gneiss and amphibolite crystal.

Ilmenite, Quartz, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Complete ilmenite crystal, probably partly pseudomorphed by magnetite, in quartz rooted in the schist contact. These crystals are very brittle and commonly very thin, so recovery of complete crystals is difficult.

Rutile

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Tiny void in a pseudomorphed ilmenite crystal in quartz showing the fine-grained, waxy, stalagtitic character of some of the pseudomorphing rutile.

Tourmaline, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Interesting glacial erratic cobble of massive quartz enclosing delicate sprays of needle tourmaline radiating from the terminations of thicker crystals. Original bedrock source unknown, but similar assemblages are present in-situ in the Torrington area north of the site..

Ilmenite, Quartz

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Partial ilmenite crystal in quartz. Former Ronald Januzzi collection.

Rutile, Ilmenite, Epidote

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Red gemmy rutile sandwiched between dark gray ilmenite in granular epidote (altered amphibolite).

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Boulder showing the larger, bluer mode of kyanite crystallization, typically in massive quartz. The sub-parallel to slightly radiating alignment causes some boulders to break into conical to fan shapes, like giant snow cones.

Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Vuggy mass of tiny chlorite crystals.

Magnesio-hornblende

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Flabellate, black magnesio-hornblende in a fine-grained, granular albite-quartz matrix. Part of an amphibole gneiss layer in the Ratlum Mountain formation. Former Ed Force collection.

Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Essentially complete ilmenite crystal (probably actually pseudomorphed by magnetite/hematite/rutile like many others) in quartz.

Ilmenite, Chlorite Group, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

A complete ilmenite crystal at upper center and other partial crystals, probably partly pseudomorphed by magnetite, in quartz and rooted in the chlorite-rich schist contact. These crystals are very brittle and commonly very thin, and the quartz very tough, so recovery of complete crystals is difficult.

Muscovite (Var: Damourite), Albite, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Damourite pseudomorphs after ? in massive, granular chlorite. Probably albite, which is the tan mineral visible at upper left and is common in these chlorite segregations.

Pinite, Quartz

State Route 118 Bantam River bridge, Litchfield, Litchfield County, Connecticut, USA

Pinite pseudomorph after cordierite in quartz from 19th century locality. From Silas Bronson Library collection (1893) Attached A. E. Foote label says simply pinite.

Stilbite Subgroup

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Stilbite crystals tucked deep in a small pocket within a quartz/kyanite/ilmenite boudin.

Slag

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

A piece of slag with bright metallic fragment that tested as nickel. This is strange as no nickel minerals are obvious at this site. But both Israel Coe and Sedgwick and Buell, who worked this site, also worked the nearby chalcopyrite-pentlandite-rich Litchfield Norite in West Torrington, so some of the ore may have ended up being processed at ...

Epidote, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Elongated epidote crystals in fine-grained chlorite.

Chabazite-Ca

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Rhombohedral chabazite-Ca crystals on a fault surface cutting schist.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Flabellate "hornblende" amphibole crystals in schistose hornblende gneiss boulder. The particular amphibole species has not been characterized, but is likely to be magnesio-hornblende based on analyses of similar crystals north of this site.

Hematite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Hematite, and probably rutile as well based on other crystals, pseudomorph after ilmenite in quartz.

Aragonite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Botryoidal, slightly waxy aragonite crust with tiny bits of sand and organics embedded. Forming in voids in heavily faulted amphibole gneiss where meteoric water is percolating through. The source of the mobilized calcium carbonate must be calc-silicate rock or the glacial soil above the rock.

Rutile, Fluorapatite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Reddish rutile in reticulated network twinning with pale gray fluorapatite, in a small void in fine-grained chlorite.

Chalcopyrite, Pyrite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Bleb of chalcopyrite and pyrite, mostly altered to "limonite", with a little bit of green malachite showing above it on the albite/quartz/biotite matrix. Signs of copper ore like this apparently lead to 18th and 19th century prospecting on the property.

Ilmenite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Tiny, dark gray, subhedral, platy ilmenite crystals in kyanite schist.

Malachite, Chalcopyrite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Halo of green malachite and brown "limonite" around a tiny bleb of chalcopyrite in albite/quartz boudin in schist. Signs of copper ore like this apparently lead to prospecting on the property.

Staurolite, Almandine

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Loose boulder of schist with porphyrobalsts of staurolite and smaller almandine. Uncertain if it is from the site or dragged south from known staurolite-rich schist just to the north.

Muscovite (Var: Damourite), Kyanite, Ilmenite, Fluorapatite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up of kyanite (blue-white cores) partly altered to damourite (yellow-white rims), with ilmenite (metallic black) in a quartz boudin in schist.

Goethite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Two glacial erratic cobbles (about 10 cm) and a pebble of massive goethite, the left one contains clasts of brecciated quartzite that appears to be the Dalton Formation. The abundance of these erratics suggests a relatively local source. But such goethite-cemented breccia is known from the Kent iron mine, which is well SW of this site. The ...

Kyanite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Parallel growth of kyanite in schist.

Pyrrhotite, Chalcopyrite, Hornblende Root Name Group

Mount Prospect complex, Litchfield, Litchfield County, Connecticut, USA

Hornblende-rich norite with grains of pyrrhotite (with pentlandite inclusions) and chalcopyrite. Former Alfred E. Hammer collection.

K Feldspar (Var: Adularia)

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Adularia crystals in what appears to be a tiny alpine cleft type gash in quartz-rich schist.

Kyanite, Ilmenite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Greenish kyanite (with some alteration to white damourite) and black ilmenite comprising a boudin in schist.

Staurolite

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Staurolite crystal in schist. Former Ronald Januzzi collection.

Malachite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Thin film of green malachite on schist. Minor signs of copper ore like this apparently lead to 18th and 19th century prospecting on the property.

Albite, Ilmenite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Blocky albite porphyroblasts with ilmenite from a boudin in schist.

Tremolite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Crudely crystallized tremolite that was apparently naturally etched out of calcite, this is how it was found.

Chabazite-Ca

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Rhombohedral chabazite-Ca crystals on a fault surface cutting schist.

Grossular, Actinolite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Chunk of typical calc-silicate rock found scattered in the Rowe schist. Mostly pale orange grossular, with pale green, fibrous actinolite, gray quartz at left and white calcite at upper right.

Kyanite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Boulder showing the gray, smaller mode of kyanite crystallization, typically in schist with some associated quartz and albite porphyroblasts.

Ilmenite, Magnetite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Large partial ilmenite crystal, probably partly pseudomorphed by magnetite, in quartz rooted in the schist contact. These crystals are very brittle and commonly very thin, and the quartz very tough, so recovery of complete crystals is difficult.

Hematite, Epidote

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Fragment of amphibolite altered to epidote showing granular, specular hematite on joint surfaces. At upper right is a small red rutile crystal next to a black ilmenite crystal.

Magnetite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

3mm thick magnetite (and hematite and rutile) pseudomorph after ilmenite. The magnetic strength varies across the crystal depending on the abundance of magnetite. The upper right edge was where the original ilmenite crystal was attached to the schist contact with the surrounding quartz.

Albite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Albite crystals in a vug in calc-silicate rock, likely where calcite naturally etched out.

Staurolite, Almandine

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Staurolite (prismatic) and almandine crystals in schist.

Chalcopyrite, Malachite, Quartz, Albite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Halo of green malachite and brown "limonite" around a tiny bleb of chalcopyrite in albite/quartz boudin in schist. Signs of copper ore like this apparently lead to prospecting on the property.

Goethite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

A goethite-cemented quartzite breccia that appears to be the Dalton Formation. The abundance of these erratics suggests a relatively local source. But such goethite-cemented breccia is known from the Kent iron mine, which is well SW of this site. The goethite mines of the Salisbury district are many km W and NW of the site, but possibly these ...

Fluorapatite, Magnetite, Chlorite Group, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Pale greenish white fluorapatite crystals in fine-grained chlorite in the lower left 1/3, with black granular magnetite dispersed in the upper right 2/3. Red area near bottom center is rutile. This piece also contains thin rutile after ilmenite pseudomorhs mostly not visible from this perspective.

Fluorapatite, Magnetite, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Pale greenish white fluorapatite crystals in fine-grained chlorite in the upper 2/3, black granular magnetite dispersed in the lower 1/3.

Fluorapatite, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Euhedral pale gray to white fluorapatite crystals in fine-grained chlorite. These crystals tend to fall out of the chlorite matrix, as evidenced by the many elongated, hexagonal voids.

Malachite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Malachite coating mica schist. The primary copper minerals that weathered to the malachite are not evident in this piece, but scattered chalcopyrite is present at the site.

Chabazite-Ca, Stilbite-Ca

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Chabazite-Ca and stilbite (upper right) crystals in a fracture in gneiss. Chabazite-Ca confirmed via SEM-EDS analysis, see child photo for spectrum.

Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Drusy quartz in voids in massive quartz perhaps opened up by some brittle faulting.

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Radially grown kyanite in quartz.

Ilmenite, Quartz

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Broken from bull quartz vein found west of Town Farm Road while conducting geologic mapping in the area.

Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Parallel growth drusy quartz lining the walls of a brittle fault void in schist.

Magnetite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Fragment of a magnetite (with chlorite and rutile in there also) pseudomorph after ilmenite in quartz.

Fluorapatite, Muscovite (Var: Damourite), Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Glassy fluorapatite crystal in quartz with yellowish muscovite variery damourite pseudomorphs after kyanite. In a quartz/kyanite/ilmenite boudin in schist.

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Oh dear, more giant kyanite crystals in quartz!

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up showing solid, parallel growth of kyanite crystals to over 20 cm.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up of "hornblende" gneiss. The particular amphibole species has not been characterized but is likely magnesio-hornblende based on analyses of similar crystals from an area north of this site.

Pinite, Quartz

State Route 118 Bantam River bridge, Litchfield, Litchfield County, Connecticut, USA

Dark brown pinite pseudomorphs after cordierite in massive quartz. Former Trinity College collection #7231. Harold Moritz specimen.

Almandine

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Loose almandine porphyroblast.

Kyanite

Litchfield, Litchfield County, Connecticut, USA

Muscovite (Var: Fuchsite)

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Magnesio-hornblende

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Pyrrhotite

Mount Prospect complex, Litchfield, Litchfield County, Connecticut, USA

Metallic grains of pyrrhotite, reportedly with intergrown pentlandite and chalcopyrite, interspersed in a black and white norite. Eric Quinter collection.

Pinite, Quartz

State Route 118 Bantam River bridge, Litchfield, Litchfield County, Connecticut, USA

Pinite pseudomorph after cordierite in quartz. Former Trinity College collection #7231. Harold Moritz specimen.

Muscovite (Var: Damourite), Kyanite, Ilmenite, Fluorapatite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Muscovite (Var: Damourite), Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Damourite pseudomorphs after kyanite in quartz.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Actinolite, Grossular

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Roughly crystallized calc-silicate assemblage - pale green fibrous actinolite and pale orange grossular, exposed when calcite was naturally etched out.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Magnetite, Hematite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Magnetite, Ilmenite, Chlorite Group, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Hematite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Partial hematite and rutile pseudomorph after ilmenite crystal in quartz.

Ilmenite, Quartz, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Muscovite (Var: Damourite), Kyanite, Stilbite Subgroup

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up of damourite pseudomorphs after terminated kyanite crystals in a quartz/kyanite/ilmenite boudin in schist. Some white stilbite is also present at lower right.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Rutile

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Tiny void in a pseudomorphed ilmenite crystal in quartz showing the fine-grained, waxy, stalagtitic character of some of the pseudomorphing rutile.

Tourmaline, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Ilmenite, Quartz

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Partial ilmenite crystal in quartz. Former Ronald Januzzi collection.

Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Vuggy mass of tiny chlorite crystals.

Rutile, Ilmenite, Epidote

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Red gemmy rutile sandwiched between dark gray ilmenite in granular epidote (altered amphibolite).

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Magnesio-hornblende

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Flabellate, black magnesio-hornblende in a fine-grained, granular albite-quartz matrix. Part of an amphibole gneiss layer in the Ratlum Mountain formation. Former Ed Force collection.

Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Essentially complete ilmenite crystal (probably actually pseudomorphed by magnetite/hematite/rutile like many others) in quartz.

Ilmenite, Chlorite Group, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Stilbite Subgroup

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Stilbite crystals tucked deep in a small pocket within a quartz/kyanite/ilmenite boudin.

Muscovite (Var: Damourite), Albite, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Damourite pseudomorphs after ? in massive, granular chlorite. Probably albite, which is the tan mineral visible at upper left and is common in these chlorite segregations.

Pinite, Quartz

State Route 118 Bantam River bridge, Litchfield, Litchfield County, Connecticut, USA

Pinite pseudomorph after cordierite in quartz from 19th century locality. From Silas Bronson Library collection (1893) Attached A. E. Foote label says simply pinite.

Slag

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Epidote, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Elongated epidote crystals in fine-grained chlorite.

Chabazite-Ca

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Rhombohedral chabazite-Ca crystals on a fault surface cutting schist.

Aragonite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Hematite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Hematite, and probably rutile as well based on other crystals, pseudomorph after ilmenite in quartz.

Rutile, Fluorapatite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Reddish rutile in reticulated network twinning with pale gray fluorapatite, in a small void in fine-grained chlorite.

Chalcopyrite, Pyrite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Ilmenite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Tiny, dark gray, subhedral, platy ilmenite crystals in kyanite schist.

Muscovite (Var: Damourite), Kyanite, Ilmenite, Fluorapatite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up of kyanite (blue-white cores) partly altered to damourite (yellow-white rims), with ilmenite (metallic black) in a quartz boudin in schist.

Malachite, Chalcopyrite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Halo of green malachite and brown "limonite" around a tiny bleb of chalcopyrite in albite/quartz boudin in schist. Signs of copper ore like this apparently lead to prospecting on the property.

Staurolite, Almandine

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Loose boulder of schist with porphyrobalsts of staurolite and smaller almandine. Uncertain if it is from the site or dragged south from known staurolite-rich schist just to the north.

Goethite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Kyanite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Parallel growth of kyanite in schist.

Pyrrhotite, Chalcopyrite, Hornblende Root Name Group

Mount Prospect complex, Litchfield, Litchfield County, Connecticut, USA

Hornblende-rich norite with grains of pyrrhotite (with pentlandite inclusions) and chalcopyrite. Former Alfred E. Hammer collection.

Staurolite

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Staurolite crystal in schist. Former Ronald Januzzi collection.

K Feldspar (Var: Adularia)

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Adularia crystals in what appears to be a tiny alpine cleft type gash in quartz-rich schist.

Kyanite, Ilmenite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Greenish kyanite (with some alteration to white damourite) and black ilmenite comprising a boudin in schist.

Tremolite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Crudely crystallized tremolite that was apparently naturally etched out of calcite, this is how it was found.

Malachite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Thin film of green malachite on schist. Minor signs of copper ore like this apparently lead to 18th and 19th century prospecting on the property.

Albite, Ilmenite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Blocky albite porphyroblasts with ilmenite from a boudin in schist.

Kyanite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Boulder showing the gray, smaller mode of kyanite crystallization, typically in schist with some associated quartz and albite porphyroblasts.

Chabazite-Ca

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Rhombohedral chabazite-Ca crystals on a fault surface cutting schist.

Grossular, Actinolite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Chunk of typical calc-silicate rock found scattered in the Rowe schist. Mostly pale orange grossular, with pale green, fibrous actinolite, gray quartz at left and white calcite at upper right.

Ilmenite, Magnetite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Hematite, Epidote

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Fragment of amphibolite altered to epidote showing granular, specular hematite on joint surfaces. At upper right is a small red rutile crystal next to a black ilmenite crystal.

Magnetite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Chalcopyrite, Malachite, Quartz, Albite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Halo of green malachite and brown "limonite" around a tiny bleb of chalcopyrite in albite/quartz boudin in schist. Signs of copper ore like this apparently lead to prospecting on the property.

Albite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Albite crystals in a vug in calc-silicate rock, likely where calcite naturally etched out.

Staurolite, Almandine

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Staurolite (prismatic) and almandine crystals in schist.

Goethite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Fluorapatite, Magnetite, Chlorite Group, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Fluorapatite, Magnetite, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Pale greenish white fluorapatite crystals in fine-grained chlorite in the upper 2/3, black granular magnetite dispersed in the lower 1/3.

Chabazite-Ca, Stilbite-Ca

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Chabazite-Ca and stilbite (upper right) crystals in a fracture in gneiss. Chabazite-Ca confirmed via SEM-EDS analysis, see child photo for spectrum.

Fluorapatite, Chlorite Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Euhedral pale gray to white fluorapatite crystals in fine-grained chlorite. These crystals tend to fall out of the chlorite matrix, as evidenced by the many elongated, hexagonal voids.

Malachite

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Malachite coating mica schist. The primary copper minerals that weathered to the malachite are not evident in this piece, but scattered chalcopyrite is present at the site.

Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Drusy quartz in voids in massive quartz perhaps opened up by some brittle faulting.

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Radially grown kyanite in quartz.

Ilmenite, Quartz

Town Farm Road, Litchfield, Litchfield County, Connecticut, USA

Broken from bull quartz vein found west of Town Farm Road while conducting geologic mapping in the area.

Fluorapatite, Muscovite (Var: Damourite), Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Glassy fluorapatite crystal in quartz with yellowish muscovite variery damourite pseudomorphs after kyanite. In a quartz/kyanite/ilmenite boudin in schist.

Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Parallel growth drusy quartz lining the walls of a brittle fault void in schist.

Magnetite, Ilmenite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Fragment of a magnetite (with chlorite and rutile in there also) pseudomorph after ilmenite in quartz.

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Oh dear, more giant kyanite crystals in quartz!

Kyanite, Quartz

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up showing solid, parallel growth of kyanite crystals to over 20 cm.

Hornblende Root Name Group

Coe's Mine, Litchfield, Litchfield County, Connecticut, USA

Close-up of "hornblende" gneiss. The particular amphibole species has not been characterized but is likely magnesio-hornblende based on analyses of similar crystals from an area north of this site.