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New Milford, Litchfield County, Connecticut, USAi
Regional Level Types
New MilfordTown
Litchfield CountyCounty
ConnecticutState
USACountry

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New Milford6,523 (2017)


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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

26 valid minerals. 1 erroneous literature entry.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

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Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Habit: anhedral
Colour: white
Description: Major component of the pegmatite.
Reference: Januzzi, 1976. Mineral Localities of CT and Southeastern NY State; USGS Prof Paper 255; Rocks & Minerals (1995) 70:396-409
Almandine
Formula: Fe2+3Al2(SiO4)3
Habit: trapezohedral and rhombic dodecahedral
Colour: maroon to nearly black
Description: An accessory in the pegmatites, also abundant subhedral metacrysts of garnet in the schist adjacent to the contacts with pegmatite. Januzzi (1959) reports finding in one isolated pegmatite mass, scores of two types of garnet crystals having both distinct dodecahedral and trapezohedral forms. Ewell (1937) writes: "The garnets were extra large, some weighing one pound each."
Reference: Van King; USGS Prof Paper 255; Januzzi (1959); Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Habit: anhedral
Colour: black
Description: fka biotite, a minor accessory in the pegmatites.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State; Cameron et al (1954): USGS Prof Paper 255
Bertrandite ?
Formula: Be4(Si2O7)(OH)2
Description: Included in the reference in a list of minerals with no supporting information.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Beryl
Formula: Be3Al2(Si6O18)
Habit: anhedral elongated prisms
Colour: pale green, yellow to honey, blue
Description: According to Cameron et al (1954), beryl is concentrated in the quartz-perthitic microcline zone in the the southwest half of no. 1 quarry as pale greenish-white, short, subhedral prisms, 3 inches in average length and 2 inches in average diameter. A 300-pound block of quartz and plagioclase found in the backfill contains at least 8 percent beryl. Also an accessory of the pegmatites in the no. 2 quarry. Sterrett (1923) reports “many crystals of beryl, some of them more than a foot in diameter”. Crystals are usually sheathed in mica and are poorly formed but internally contain some of the best gem beryl rough found in Connecticut.
Reference: Januzzi, 1976. Mineral Localities of CT and Southeastern NY State; USGS Prof Paper 255; Rocks & Minerals (1995) 70:396-409; Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.
Beryl var. Aquamarine
Formula: Be3Al2Si6O18
Habit: subhedral elongated prisms
Colour: blue, blue-green
Description: Much more rare than the common green beryl or yellow beryl, but a 40.44-carat aquamarine (no. 1037) is in the Smithsonian.
Reference: Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.; Rocks & Minerals (1995) 70:396-409
Beryl var. Heliodor
Formula: Be3Al2(Si6O18)
Colour: yellow to honey
Description: Crystals poorly formed, but internally hide some of the best gem rough from Connecticut, with deep golden yellow to honey color.
Reference: Rocks & Min.: 70:379; Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.
Calcite
Formula: CaCO3
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), 70(6): 398.
Chondrodite
Formula: Mg5(SiO4)2F2
Habit: granular
Colour: light brown
Fluorescence: light yellow under SW UV
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), 70(6): 398.
Columbite-(Fe)
Formula: Fe2+Nb2O6
Reference: Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.
Diopside
Formula: CaMgSi2O6
Habit: flattened short to elongated prisms
Colour: white to very pale green
Fluorescence: light blue-gray under SW
Description: pseudomorphed by tremolite (originally called Canaanite)
Reference: Harold Moritz collection
Fluorapatite
Formula: Ca5(PO4)3F
Description: Included in just a list of minerals in one reference, but it is such a common accessory that it is certainly present.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
'Garnet Group'
Formula: X3Z2(SiO4)3
Description: Probably almandine as is most pegmatitic garnet in Connecticut.
Reference: Ryerson, Kathleen H. (1972) Rock Hounds Guide to Connecticut
'Gummite'
Description: Associated with uraninite, meta-autunite, uranophane, other alteration products. Fine gummite and uranophane pseudomorphs after uraninite have been found here.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Hematite ?
Formula: Fe2O3
Description: Included in the reference in a list of minerals with no supporting documentation.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
'Limonite'
Description: Common surficial alteration product staining other rocks and minerals.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Meta-autunite
Formula: Ca(UO2)2(PO4)2 · 6H2O
Description: Associated with uraninite, uranophane, "gummite" and other alteration products.
Reference: Januzzi (1959); Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.
Metatorbernite
Formula: Cu(UO2)2(PO4)2 · 8H2O
Description: Associated with uraninite, meta-autunite, uranophane, "gummite" and other alteration products.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Microcline
Formula: K(AlSi3O8)
Habit: anhedral
Description: A major component of the pegmatites. In the perthitic microcline-quartz zone of the No.1 quarry, in large anhedral crystals as much as 10 feet long. In the eastern part of the north wall, the zone is richest in massive perthitic microcline toward the center of the pegmatite, and this suggests the presence of a perthitic microcline core. Locally, the microcline is veined and partly replaced with granular milky quartz, deformed muscovite and pink-red garnet. Graphic granite is fairly common.
Reference: Cameron and other (1954): Pegmatite Investigations New England. USGS Prof. Paper 255.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: tabular subhedral
Colour: green to pale ruby
Description: In the microcline-quartz zone of the no. 1 quarry it occurs in small quantities as books 3 inches in diameter. The muscovite-microcline unit of this pegmatite consists chiefly of diversely oriented scrap muscovite books forming 70 to 90 percent of the total volume. One block of “solid mica” of irregular shape blasted loose from this zone measured 4 feet thick and 8 feet long. http://www.mindat.org/photo-204409.html Crystals average 1 inch in diameter but range from 1/8 to 6 inches across. There are three types of mica deposits in the 4 pegmatites of the no. 2 quarry: pod, wall-zone, and disseminated. Pegmatite A has a concentration of books as much as 1 foot in diameter, Pegmatite B exhibits a lean book mica-bearing zone composed of quartz, albite, and muscovite. The books are 3 to 4 inches in average diameter. Pegmatites C and D are disseminated mica deposits.
Reference: Januzzi, 1976. Mineral Localities of CT and Southeastern NY State; USGS Prof Paper 255, Sterrett (1923)
Opal
Formula: SiO2 · nH2O
Habit: encrustations
Fluorescence: green
Description: Commonly forms crusts in cracks and joints in pegmatites, best found by its bright green fluorescence under SW UV illumination.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Opal var. Opal-AN
Formula: SiO2 · nH2O
Habit: encrustations
Fluorescence: green
Description: Commonly forms crusts in cracks and joints in pegmatites, best found by its bright green fluorescence under SW UV illumination.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Habit: granular
Colour: brown
Fluorescence: pale yellow-brown under SW UV
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), 70(6): 398.
Phosphuranylite
Formula: KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
Pyrite
Formula: FeS2
Habit: granular to cuboctahderal
Description: good crystals can reach 5-6 cm
Reference: Field observations
Pyrolusite
Formula: Mn4+O2
Description: No pyrolusite dendrite or staining in a granite pegmatite in the world has been verified as pyrolusite. The name was a mistake in the nineteenth century which has been widely publicized.
Reference: Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
Quartz
Formula: SiO2
Reference: Samuel Robinson (1825) A Catalogue of American Minerals, with their localities. Boston
'Scapolite'
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), 70(6): 398.
Schorl
Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: subhedral, elongated prisms
Colour: black
Description: Common accessory in the pegmatites, especially in the border zone forming subhedral needles from ¼ inch to 3 inches long, oriented normal to the contact, and in the surrounding schist.
Reference: Januzzi, (1976): Mineral Localities of CT and Southeastern NY State;
Siderite
Formula: FeCO3
Reference: Samuel Robinson (1825) A Catalogue of American Minerals, with their localities. Boston
'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z
Reference: Elwell, Wilbur. (1937): Some Old Localities in Connecticut. Rocks and Minerals, vol 12, no. 9, pp. 270-1.; USGS Prof Paper 255
Tremolite
Formula: ◻{Ca2}{Mg5}(Si8O22)(OH)2
Habit: Primary - bladed, pseudomorphs after diopside are flattened short to elongated prisms
Colour: white, pale gray, pale green
Fluorescence: light blue-gray under SW
Description: as primary crystal or as pseudomorphs after diopside (originally called canaanite)
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), 70(6): 398.
Uraninite
Formula: UO2
Habit: octahedral
Description: Associated with secondaries, sometimes pseudomorphed by uranophane and "gummite".
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State; Rocks & Minerals (1995) 70:396-409
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Description: Associated with uraninite, meta-autunite, "gummite", other alteration products. Fine gummite and uranophane pseudomorphs after uraninite have been found here.
Reference: Januzzi (1976): Mineral Localities of CT and Southeastern NY State
Zircon
Formula: Zr(SiO4)
Colour: brown
Description: Accessory in the pegmatites.
Reference: Fred E Davis collection

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Columbite-(Fe)4.DB.35Fe2+Nb2O6
Hematite ?4.CB.05Fe2O3
Opal4.DA.10SiO2 · nH2O
var. Opal-AN4.DA.10SiO2 · nH2O
Pyrolusite ?4.DB.05Mn4+O2
Quartz4.DA.05SiO2
Uraninite4.DL.05UO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Siderite5.AB.05FeCO3
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Meta-autunite8.EB.10Ca(UO2)2(PO4)2 · 6H2O
Metatorbernite8.EB.10Cu(UO2)2(PO4)2 · 8H2O
Phosphuranylite8.EC.10KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Almandine9.AD.25Fe2+3Al2(SiO4)3
Annite9.EC.20KFe2+3(AlSi3O10)(OH)2
Bertrandite ?9.BD.05Be4(Si2O7)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
var. Aquamarine9.CJ.05Be3Al2Si6O18
var. Heliodor9.CJ.05Be3Al2(Si6O18)
Chondrodite9.AF.45Mg5(SiO4)2F2
Diopside9.DA.15CaMgSi2O6
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Schorl9.CK.05NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Tremolite9.DE.10◻{Ca2}{Mg5}(Si8O22)(OH)2
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Garnet Group'-X3Z2(SiO4)3
'Gummite'-
'Limonite'-
'Scapolite'-
'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H Opal var. Opal-ANSiO2 · nH2O
H PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
H Meta-autuniteCa(UO2)2(PO4)2 · 6H2O
H MetatorberniteCu(UO2)2(PO4)2 · 8H2O
H OpalSiO2 · nH2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
H PhlogopiteKMg3(AlSi3O10)(OH)2
H AnniteKFe32+(AlSi3O10)(OH)2
H BertranditeBe4(Si2O7)(OH)2
BeBeryllium
Be Beryl var. AquamarineBe3Al2Si6O18
Be Beryl var. HeliodorBe3Al2(Si6O18)
Be BerylBe3Al2(Si6O18)
Be BertranditeBe4(Si2O7)(OH)2
BBoron
B TourmalineAD3G6 (T6O18)(BO3)3X3Z
B SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
CCarbon
C CalciteCaCO3
C SideriteFeCO3
OOxygen
O Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
O Beryl var. AquamarineBe3Al2Si6O18
O AlmandineFe32+Al2(SiO4)3
O Beryl var. HeliodorBe3Al2(Si6O18)
O BerylBe3Al2(Si6O18)
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O DiopsideCaMgSi2O6
O CalciteCaCO3
O Columbite-(Fe)Fe2+Nb2O6
O TourmalineAD3G6 (T6O18)(BO3)3X3Z
O FluorapatiteCa5(PO4)3F
O Opal var. Opal-ANSiO2 · nH2O
O UraniniteUO2
O PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
O Meta-autuniteCa(UO2)2(PO4)2 · 6H2O
O QuartzSiO2
O SideriteFeCO3
O Garnet GroupX3Z2(SiO4)3
O MetatorberniteCu(UO2)2(PO4)2 · 8H2O
O ZirconZr(SiO4)
O OpalSiO2 · nH2O
O MuscoviteKAl2(AlSi3O10)(OH)2
O SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
O ChondroditeMg5(SiO4)2F2
O PhlogopiteKMg3(AlSi3O10)(OH)2
O AlbiteNa(AlSi3O8)
O AnniteKFe32+(AlSi3O10)(OH)2
O MicroclineK(AlSi3O8)
O BertranditeBe4(Si2O7)(OH)2
O HematiteFe2O3
O PyrolusiteMn4+O2
FFluorine
F FluorapatiteCa5(PO4)3F
F ChondroditeMg5(SiO4)2F2
NaSodium
Na SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Na AlbiteNa(AlSi3O8)
MgMagnesium
Mg Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Mg DiopsideCaMgSi2O6
Mg ChondroditeMg5(SiO4)2F2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
AlAluminium
Al Beryl var. AquamarineBe3Al2Si6O18
Al AlmandineFe32+Al2(SiO4)3
Al Beryl var. HeliodorBe3Al2(Si6O18)
Al BerylBe3Al2(Si6O18)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al AlbiteNa(AlSi3O8)
Al AnniteKFe32+(AlSi3O10)(OH)2
Al MicroclineK(AlSi3O8)
SiSilicon
Si Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Si Beryl var. AquamarineBe3Al2Si6O18
Si AlmandineFe32+Al2(SiO4)3
Si Beryl var. HeliodorBe3Al2(Si6O18)
Si BerylBe3Al2(Si6O18)
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si DiopsideCaMgSi2O6
Si Opal var. Opal-ANSiO2 · nH2O
Si QuartzSiO2
Si Garnet GroupX3Z2(SiO4)3
Si ZirconZr(SiO4)
Si OpalSiO2 · nH2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Si ChondroditeMg5(SiO4)2F2
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si AlbiteNa(AlSi3O8)
Si AnniteKFe32+(AlSi3O10)(OH)2
Si MicroclineK(AlSi3O8)
Si BertranditeBe4(Si2O7)(OH)2
PPhosphorus
P FluorapatiteCa5(PO4)3F
P PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
P Meta-autuniteCa(UO2)2(PO4)2 · 6H2O
P MetatorberniteCu(UO2)2(PO4)2 · 8H2O
SSulfur
S PyriteFeS2
KPotassium
K PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
K MuscoviteKAl2(AlSi3O10)(OH)2
K PhlogopiteKMg3(AlSi3O10)(OH)2
K AnniteKFe32+(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
CaCalcium
Ca Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Ca DiopsideCaMgSi2O6
Ca CalciteCaCO3
Ca FluorapatiteCa5(PO4)3F
Ca PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
Ca Meta-autuniteCa(UO2)2(PO4)2 · 6H2O
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe Columbite-(Fe)Fe2+Nb2O6
Fe SideriteFeCO3
Fe PyriteFeS2
Fe SchorlNaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Fe AnniteKFe32+(AlSi3O10)(OH)2
Fe HematiteFe2O3
CuCopper
Cu MetatorberniteCu(UO2)2(PO4)2 · 8H2O
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Columbite-(Fe)Fe2+Nb2O6
UUranium
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
U UraniniteUO2
U PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
U Meta-autuniteCa(UO2)2(PO4)2 · 6H2O
U MetatorberniteCu(UO2)2(PO4)2 · 8H2O

Fossils

This region is too big to display the fossil list, try looking at smaller subregions.

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/New_Milford,_Connecticut
Wikidata ID:Q977989
GeoNames ID:4839435

Localities in this Region

Other Regions, Features and Areas that Intersect


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