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Roncari Quarry, East Granby, Hartford County, Connecticut, USAi
Regional Level Types
Roncari QuarryQuarry
East GranbyTown
Hartford CountyCounty
ConnecticutState
USACountry

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PhotosMapsSearch
Latitude & Longitude (WGS84):
41° 56' 16'' North , 72° 44' 21'' West
Latitude & Longitude (decimal):
41.93778,-72.73944
GeoHash:
G#: drkq8f8c2
GRN:
N28W40
Type:
Quarry
Köppen climate type:
Dfa : Hot-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Tariffville1,324 (2017)3.7km
Salmon Brook2,324 (2017)5.1km
Simsbury Center5,836 (2017)8.7km
Suffield Depot1,325 (2017)8.8km
Windsor Locks12,498 (2017)9.3km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Connecticut Valley Mineral ClubSpringfield, Massachusetts22km
Bristol Gem & Mineral ClubBristol, Connecticut34km
Lapidary and Mineral Society of Central ConnecticutMeriden, Connecticut45km
Mindat Locality ID:
6767
Long-form identifier:
mindat:1:2:6767:9
GUID (UUID V4):
d207ae75-3f0f-4535-9aae-fd8e86d736ce
Other/historical names associated with this locality:
Tilcon Quarry


Quarry in the Jurassic (205 mya) Holyoke Basalt. Mineralization occurs in gas vesicles (pockets) and in fault zones, some of them heavily brecciated and recemented with fine-grained calcite.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


21 valid minerals. 2 erroneous literature entries.

* - Minerals that have never been found, but their existence is inferred in some way (e.g. from pseudomorphs)

Detailed Mineral List:

ⓘ Anhydrite
Formula: CaSO4
Habit: tabular voids
Description: Tabular voids in later crystallized minerals are very common here, as in all Connecticut trap rock quarries. Nearly all anhydrite in the basalt dissolved away leaving these voids.
✪ 'Apophyllite Group'
Formula: AB4[Si8O22]X · 8H2O
Habit: tabular, in spherical aggregates
Colour: white to creamy
Description: Aggregates of tabular crystals can reach 3 to 4 cm. This habit is characteristic for this locality, other area trap rock quarries have bipyramidal crystals.
ⓘ Aragonite
Formula: CaCO3
✪ Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Habit: blocky to wedge-shaped
Colour: black
Description: Crystals to a little over 1 cm, surfaces are mix of smooth and lustrous to rough textures. Commonly associated with prehnite, calcite and quartz.
ⓘ Baryte
Formula: BaSO4
Description: Mistaken identification of calcite crystals twinned on a face of the shallow negative rhombohedron and showing much growth distortion so that they look tabular.
✪ Calcite
Formula: CaCO3
Habit: rhombohedral, scalenohedral, tabular butterfly twins on {01bar12}
Colour: white, pale rose
Fluorescence: orange-red
Description: A variety of forms and sizes occur, most commonly rhombohedral and scalenohedral, with rhombic overgrowths up to 4 cm on scalenohedral cores showing a pale rose color and frosty luster associated with sprays of needle quartz epimorphic on dissolved anhydrite. Tabular butterfly twins to 5mm or so also occur.
ⓘ Celestine
Formula: SrSO4
Habit: tabular
Colour: colorless to very pale blue
Description: Crystals typically small, <1.5 cm.
References:
John Burnham
ⓘ 'Chalcodite'
Formula: K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
References:
R. Zinderman photo
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ 'Chlorite Group'
ⓘ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
✪ Datolite
Formula: CaB(SiO4)(OH)
Habit: complex prisms with chisel-point terminations
Colour: pale apple green
Description: Gas vesicles rich in crystals lining the walls were once abundant. Never found singly. Crystals can reach over 2.5 cm, larger ones typically transparent, smaller crystals translucent to opaque - grading to porcelaineous crusts. Excellent specimens in major museums.
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
✪ Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Habit: tabular, in spherical aggregates
Colour: white to creamy
Description: Aggregates of tabular crystals can reach 3 to 4 cm. This habit is characteristic for this locality, other area trap rock quarries have mostly bipyramidal crystals.
ⓘ Fluorite
Formula: CaF2
References:
John Burnham
ⓘ Galena
Formula: PbS
Habit: skeletal cuboctahedral
Colour: gray
Description: A single 12mm skeletal cuboctahedral crystal is known, associated with datolite and yellow calcite.
ⓘ Goethite
Formula: α-Fe3+O(OH)
ⓘ Gypsum
Formula: CaSO4 · 2H2O
References:
John Burnham
ⓘ Gypsum var. Selenite
Formula: CaSO4 · 2H2O
References:
John Burnham
✪ Hematite
Formula: Fe2O3
Habit: coatings, botryoidal aggregates, rosettes
Colour: specular to rusty-red
Description: Mostly as rusty-red coatings on calcite and quartz, tiny blebs or as specular to rusty-red rosettes to several mm.
ⓘ Hematite var. Iron Rose
Formula: Fe2O3
ⓘ 'Julgoldite Subgroup'
Formula: Ca2XFe3+2[Si2O6(OH)][SiO4](OH)2A
Habit: isolated botryoidal or "bow-tie" radiating crystal aggregates.
Colour: very dark green
Description: Identified by Raman spectroscopy as pumpellyite.
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
Habit: massive to acicular
Colour: green
Description: Associated with chrysocolla.
ⓘ 'Manganese Oxides'
References:
John Burnham
ⓘ 'Manganese Oxides var. Manganese Dendrites'
References:
John Burnham
ⓘ 'Petroleum var. Albertite'
References:
John Burnham
ⓘ 'Petroleum var. Bitumen'
Habit: amorphous
Colour: black
Description: Brittle, glassy, conchoidal fracture with sharp edges. Found in faults and pockets. Dessicated residue from the upward migration of crude oil from stratigraphically lower, petroleum-rich black shales in the Shuttle Meadow Formation.
✪ Prehnite
Formula: Ca2Al2Si3O10(OH)2
Habit: Botryoidal to conical aggregates of tabular crystals
Colour: various shades of green
✪ 'Pumpellyite Group'
Formula: Ca2XZ2[Si2O6(OH)][SiO4](OH)2A
Habit: microfibrous botryoids, crusts, bowties
Colour: blue-green, dark olive green to black
Description: Few specimens have been confirmed by analyses to differentiate it from several other possible pumpellyite group minerals.
ⓘ 'Pumpellyite Subgroup'
Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
Habit: isolated botryoidal or "bow-tie" radiating crystal aggregates.
Colour: very dark green
Description: As late-forming micro-crystal aggregates in pockets. Thought to be julgoldite but identified as pumpellyite using Raman spectroscopy by Paul Bartholomew, U. of New Haven, 2014.
ⓘ Pyrite
Formula: FeS2
✪ Quartz
Formula: SiO2
Habit: elongated prismatic, Cumberland habit
Colour: colorless, milky, smoky
Description: Typically associated with calcite, datolite or prehnite, crystals range from tiny ones epimorphing dissolved anhydrite (forming sparkling columns to a several cm long) to prismatic ones to 15 cm. Cumberland habit crystals typcially up to 1-2 cm found in groups or singly.
ⓘ Quartz var. Amethyst
Formula: SiO2
ⓘ Quartz var. Milky Quartz
Formula: SiO2
References:
John Burnham
ⓘ Quartz var. Smoky Quartz
Formula: SiO2
ⓘ Sphalerite
Formula: ZnS
References:
John Burnham
ⓘ 'Stilbite Subgroup'
Formula: M6-7[Al8-9Si27-28O72] · nH2O
ⓘ Stilpnomelane
Formula: (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
References:
John Burnham

Gallery:

AB4[Si8O22]X · 8H2Oⓘ 'Apophyllite Group'
Ca2(Fe,Mn)FeSi5O14(OH)ⓘ Babingtonite
CaCO3ⓘ Calcite
SrSO4ⓘ Celestine
K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27ⓘ 'Chalcodite'
CuFeS2ⓘ Chalcopyrite
ⓘ 'Chlorite Group'
Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1ⓘ Chrysocolla
CaB(SiO4)(OH)ⓘ Datolite
(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)ⓘ Epidote
KCa4(Si8O20)(F,OH) · 8H2Oⓘ Fluorapophyllite-(K)
CaF2ⓘ Fluorite
PbSⓘ Galena
CaSO4 · 2H2Oⓘ Gypsum var. Selenite
Fe2O3ⓘ Hematite
Fe2O3ⓘ Hematite var. Iron Rose
Ca2Al2Si3O10(OH)2ⓘ Prehnite
Ca2XZ2[Si2O6(OH)][SiO4](OH)2Aⓘ 'Pumpellyite Group'
SiO2ⓘ Quartz
SiO2ⓘ Quartz var. Amethyst
SiO2ⓘ Quartz var. Smoky Quartz
ZnSⓘ Sphalerite
(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2Oⓘ Stilpnomelane

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘGalena2.CD.10PbS
ⓘPyrite2.EB.05aFeS2
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.α-Fe3+O(OH)
ⓘHematite
var. Iron Rose		4.CB.05Fe2O3
ⓘ4.CB.05Fe2O3
ⓘQuartz
var. Amethyst		4.DA.05SiO2
ⓘvar. Milky Quartz4.DA.05SiO2
ⓘvar. Smoky Quartz4.DA.05SiO2
ⓘ4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAragonite5.AB.15CaCO3
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘAnhydrite ?7.AD.30CaSO4
ⓘCelestine7.AD.35SrSO4
ⓘBaryte ?7.AD.35BaSO4
ⓘGypsum7.CD.40CaSO4 · 2H2O
ⓘvar. Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
ⓘDatolite9.AJ.20CaB(SiO4)(OH)
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘBabingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
ⓘFluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘ'Chalcodite'9.EG.40K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
ⓘStilpnomelane9.EG.40(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Unclassified
ⓘ'Manganese Oxides'-
ⓘ'Pumpellyite Group'-Ca2XZ2[Si2O6(OH)][SiO4](OH)2A
ⓘ'Apophyllite Group'-AB4[Si8O22]X · 8H2O
ⓘ'Stilbite Subgroup'-M6-7[Al8-9Si27-28O72] · nH2O
ⓘ'Manganese Oxides
var. Manganese Dendrites'		-
ⓘ'Petroleum
var. Albertite'		-
ⓘ'var. Bitumen'-
ⓘ'Chlorite Group'-
ⓘ'Pumpellyite Subgroup'-Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ'Julgoldite Subgroup' ?-Ca2XFe3+2[Si2O6(OH)][SiO4](OH)2A

List of minerals for each chemical element

HHydrogen
Hⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Hⓘ BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Hⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hⓘ DatoliteCaB(SiO4)(OH)
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Hⓘ Goethiteα-Fe3+O(OH)
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Hⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Hⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Hⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Hⓘ Pumpellyite GroupCa2XZ2[Si2O6(OH)][SiO4](OH)2A
Hⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Hⓘ Julgoldite SubgroupCa2XFe23+[Si2O6(OH)][SiO4](OH)2A
BBoron
Bⓘ DatoliteCaB(SiO4)(OH)
CCarbon
Cⓘ AragoniteCaCO3
Cⓘ CalciteCaCO3
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ Quartz var. AmethystSiO2
Oⓘ AnhydriteCaSO4
Oⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Oⓘ AragoniteCaCO3
Oⓘ BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Oⓘ BaryteBaSO4
Oⓘ CalciteCaCO3
Oⓘ CelestineSrSO4
Oⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oⓘ DatoliteCaB(SiO4)(OH)
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Oⓘ Goethiteα-Fe3+O(OH)
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HematiteFe2O3
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Oⓘ QuartzSiO2
Oⓘ Quartz var. Smoky QuartzSiO2
Oⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Oⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Oⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Oⓘ Quartz var. Milky QuartzSiO2
Oⓘ Hematite var. Iron RoseFe2O3
Oⓘ Pumpellyite GroupCa2XZ2[Si2O6(OH)][SiO4](OH)2A
Oⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Oⓘ Julgoldite SubgroupCa2XFe23+[Si2O6(OH)][SiO4](OH)2A
FFluorine
Fⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Fⓘ FluoriteCaF2
NaSodium
Naⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
MgMagnesium
Mgⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Mgⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
AlAluminium
Alⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ PrehniteCa2Al2Si3O10(OH)2
Alⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Alⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Alⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Alⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
SiSilicon
Siⓘ Quartz var. AmethystSiO2
Siⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Siⓘ BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Siⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siⓘ DatoliteCaB(SiO4)(OH)
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Siⓘ QuartzSiO2
Siⓘ Quartz var. Smoky QuartzSiO2
Siⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Siⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Siⓘ Quartz var. Milky QuartzSiO2
Siⓘ Pumpellyite GroupCa2XZ2[Si2O6(OH)][SiO4](OH)2A
Siⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Siⓘ Julgoldite SubgroupCa2XFe23+[Si2O6(OH)][SiO4](OH)2A
SSulfur
Sⓘ AnhydriteCaSO4
Sⓘ BaryteBaSO4
Sⓘ CelestineSrSO4
Sⓘ ChalcopyriteCuFeS2
Sⓘ GalenaPbS
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
Sⓘ Gypsum var. SeleniteCaSO4 · 2H2O
KPotassium
Kⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Kⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Kⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
CaCalcium
Caⓘ AnhydriteCaSO4
Caⓘ AragoniteCaCO3
Caⓘ BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Caⓘ CalciteCaCO3
Caⓘ DatoliteCaB(SiO4)(OH)
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Caⓘ FluoriteCaF2
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Caⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Caⓘ Gypsum var. SeleniteCaSO4 · 2H2O
Caⓘ Pumpellyite GroupCa2XZ2[Si2O6(OH)][SiO4](OH)2A
Caⓘ Julgoldite SubgroupCa2XFe23+[Si2O6(OH)][SiO4](OH)2A
MnManganese
Mnⓘ BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Feⓘ BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Feⓘ ChalcopyriteCuFeS2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ Goethiteα-Fe3+O(OH)
Feⓘ HematiteFe2O3
Feⓘ PyriteFeS2
Feⓘ Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Feⓘ Hematite var. Iron RoseFe2O3
Feⓘ ChalcoditeK(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27
Feⓘ Julgoldite SubgroupCa2XFe23+[Si2O6(OH)][SiO4](OH)2A
CuCopper
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuⓘ MalachiteCu2(CO3)(OH)2
ZnZinc
Znⓘ SphaleriteZnS
SrStrontium
Srⓘ CelestineSrSO4
BaBarium
Baⓘ BaryteBaSO4
PbLead
Pbⓘ GalenaPbS

Mindat Articles

"Barf" Datolite by Paul Gilmore


Other Regions, Features and Areas containing this locality

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Wolfe, C. W. and Vilks, I. (1960): Pseudomorphs after Datolite, Prehnite and Apophyllite from East Granby, Connecticut. American Mineralogist: 45: 443-447.
Ryerson, Kathleen, H. (1972): Rock Hound's Guide to Connecticut. Pequot Press.
Hubert, John F., Paul E. Feshbach-Meriney and Michael A. Smith. (1992). The Triassic-Jurassic Hartford Rift Basin, Connecticut and Massachusetts: Evolution, Sandstone Diagenesis, and Hydrocarbon History. AAPG Bulletin: 76(11).
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.
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