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East Village pegmatite, Monroe, Fairfield Co., Connecticut, USAi
Regional Level Types
East Village pegmatitePegmatite
Monroe- not defined -
Fairfield Co.County
ConnecticutState
USACountry

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Latitude & Longitude (WGS84):
41° 21' 57'' North , 73° 11' 5'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Ansonia18,854 (2017)9.1km
Shelton41,296 (2017)9.4km
Derby12,700 (2017)9.4km
Oxford11,345 (2017)9.5km
Seymour16,562 (2017)9.7km


Very little has been written about this obscure locality, best known for its rose quartz. This text is from Crowley (1968):

"About 1 1/2 mi. north of East Village and 800 ft east northeast of the hairpin bend in Boys Halfway River is an old quarry in an extremely coarse-grained pegmatite, which locally exhibits a graphic-granite texture... Schairer (1931) describes it as "a small feldspar quarry where rose quartz, muscovite, biotite, garnet, columbite and feldspar are abundant." This may be the location described by Shepard (1837, p. 137): "A coarse grained granite in the northwestern part of Monroe, has afforded the most interesting variety of well crystallized and handsomely colored beryl .. ." The problem with that statement is that the East Village pegmatite is in the northeastern part of Monroe.

Januzzi (1959) states: "This pegmatite has produced some beautiful specimens of rose quartz, some of which have been cut into semi-precious gemstones. Other minerals found here are muscovite, biotite, garnet, feldspar and columbite."

Ryerson (1976) lists albite, chalcopyrite, columbite, garnet, manganapatite, quartz, and uranophane.

The prospect is a small pit barely 2 meters deep and 5 meters wide, with the mostly milky quartz core of the pegmatite partly exposed.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Description: Reference provides no details, but its occurrence is very likely.
Reference: Ryerson, Kathleen. (1976) Rock Hound's Guide to Connecticut.
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Habit: thin tabular, subhedral
Colour: black
Description: f.k.a. biotite. Thin plates, scattered, subhedral, to at least 15 cm.
Reference: Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Hartford, Connecticut. Bulletin 51.
Beryl
Formula: Be3Al2(Si6O18)
Habit: elongated prisms
Colour: greenish white
Description: "The crystals, which are greenish white and very thickly disseminated through the rock, are generally from one quarter to three quarters of an inch in diameter, much elongated, and often bent either by a gradual curvature or else by a slipping of the cross laminae successively towards one side, throughout the entire length of the crystal." Shepard (1837).
Reference: Shepard, Charles U. (1837): A Report on the Geological Survey of Connecticut. p. 137.
Chalcopyrite
Formula: CuFeS2
Description: Reference provides no details, but its occurrence is plausible.
Reference: Ryerson, Kathleen. (1976) Rock Hound's Guide to Connecticut.
'Columbite-(Fe)-Columbite-(Mn) Series'
Description: References provide no details, but its occurrence is very plausible.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 397.
Fluorapatite
Formula: Ca5(PO4)3F
Description: Reference provides no details, but its occurrence is very likely.
Reference: Ryerson, Kathleen. (1976) Rock Hound's Guide to Connecticut.
'Garnet Group'
Formula: X3Z2(SiO4)3
Description: References provide no details, but its occurrence is very plausible.
Reference: Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Hartford Conn. Bull. 51.
Microcline
Formula: K(AlSi3O8)
Habit: subhedral
Colour: tan to gray
Description: Locality apparently quarried for this mineral, which is coarse-grained and has graphic granite texture, in part.
Reference: Crowley, William Patrick. (1968): The Bedrock Geology of the Long Hill and Bridgeport Quadrangles. State Geological and Natural History Survey of Connecticut, Quadrangle Report No. 24, p. 73.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Reference provides no details, but its occurrence is very likely.
Reference: Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Hartford Conn. Bull. 51.
Quartz
Formula: SiO2
Habit: massive
Colour: colorless, smoky, milky
Description: A major constituent of the pegmatite, especially the pure quartz core zone.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 397.
Quartz var: Rose Quartz
Formula: SiO2
Habit: massive
Colour: pale rose
Description: Color generally subtle, grades from milky quartz. Some reportedly asteriated.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 396-409.
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Description: Reference provides no details, but its occurrence is very plausible.
Reference: Ryerson, Kathleen. (1976) Rock Hound's Guide to Connecticut.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Rose Quartz4.DA.05SiO2
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Annite9.EC.20KFe2+3(AlSi3O10)(OH)2
Beryl9.CJ.05Be3Al2(Si6O18)
Microcline9.FA.30K(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Unclassified Minerals, Rocks, etc.
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Uranophane53.3.1.2Ca(UO2)2(SiO3OH)2 · 5H2O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Beryl61.1.1.1Be3Al2(Si6O18)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Annite71.2.2b.3KFe2+3(AlSi3O10)(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
'Columbite-(Fe)-Columbite-(Mn) Series'-
'Garnet Group'-X3Z2(SiO4)3
Quartz
var: Rose Quartz
-SiO2

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H AnniteKFe32+(AlSi3O10)(OH)2
BeBeryllium
Be BerylBe3Al2(Si6O18)
OOxygen
O Quartz (var: Rose Quartz)SiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O Garnet GroupX3Z2(SiO4)3
O MicroclineK(AlSi3O8)
O BerylBe3Al2(Si6O18)
O AlbiteNa(AlSi3O8)
O FluorapatiteCa5(PO4)3F
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O AnniteKFe32+(AlSi3O10)(OH)2
O QuartzSiO2
FFluorine
F FluorapatiteCa5(PO4)3F
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al MicroclineK(AlSi3O8)
Al BerylBe3Al2(Si6O18)
Al AlbiteNa(AlSi3O8)
Al AnniteKFe32+(AlSi3O10)(OH)2
SiSilicon
Si Quartz (var: Rose Quartz)SiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Garnet GroupX3Z2(SiO4)3
Si MicroclineK(AlSi3O8)
Si BerylBe3Al2(Si6O18)
Si AlbiteNa(AlSi3O8)
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si AnniteKFe32+(AlSi3O10)(OH)2
Si QuartzSiO2
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S ChalcopyriteCuFeS2
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K MicroclineK(AlSi3O8)
K AnniteKFe32+(AlSi3O10)(OH)2
CaCalcium
Ca FluorapatiteCa5(PO4)3F
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
FeIron
Fe ChalcopyriteCuFeS2
Fe AnniteKFe32+(AlSi3O10)(OH)2
CuCopper
Cu ChalcopyriteCuFeS2
UUranium
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Ordovician - Neoproterozoic
443.8 - 1000 Ma



ID: 3190671
Precambrian-Phanerozoic sedimentary rocks

Age: Neoproterozoic to Ordovician (443.8 - 1000 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Middle Ordovician
458.4 - 470 Ma



ID: 2922376
Collinsville Formation

Age: Middle Ordovician (458.4 - 470 Ma)

Stratigraphic Name: Collinsville Formation

Description: Mixture of rock types as described for the two members; in many areas felsic and mafic striped metavolcanic rocks predominate.

Comments: Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Gneiss Dome Belt. Hawley Formation and equivalent formations (includes Collinsville Formation) (Middle Ordovician). Two members referred to in primary description are units: Ocs and Ocg. Secondary unit description per CT008. Secondary unit description from USGS Geologic Names lexicon (ref. CT017): Metamorphic strata in the report area that lie above the Bristol Gneiss (as it is here revised) and below The Straits Schist are assigned to the Collinsville Formation. Unit is divided into a lower unnamed hornblende gneiss member (was uppermost part of Stanley's (1964) Bristol Member) approximately 400 ft thick, an unnamed metaquartzite member that averages 100 ft, and the upper Sweetheart Mountain Member adopted here as defined by Stanley. Inferred age is Middle Ordovician. Correlates, at least in part, with the Hawley Formation of MA (Simpson, 1990). Also from ref. CT017: Part of Bronson Hill anticlinorium, not part of Rowe-Hawley zone, but discussed in this report to emphasize importance of junction between Rowe-Hawley zone and Bronson Hill anticlinorium. Collinsville is exposed in Granville and Shelburne Falls domes, and to a limited extent in Goshen dome (Hatch and Warren, 1982). Consists of various light-colored, plagioclase-rich gneisses and interlayered amphibolite and hornblende gneiss. Upper part is amphibolite-rich; lower part is predominantly feldspathic gneiss. In places, thin aluminous feldspathic schist, locally containing coticule and amphibolite, forms an upper unnamed member of formation in Granville dome, or is Sweetheart Mountain Member of Stanley (1964) in Collinsville and Bristol domes in CT. Most complete sequence is in Shelburne Falls dome where L.M. Hall (1977, written commun.) has recognized seven mappable subdivisions. With minor modification, they are (ascending) 1) amphibolite with thin felsic gneiss layers; 2) rusty-weathering massive granulites; 3) very homogeneous garnetiferous biotite gneiss; 4) interlayered amphibolite and felsic gneiss; 5) felsic gneiss with scattered biotite +/-magnetite, garnet, and hornblende; 6) interbedded amphibolite and white felsic gneiss; and 7) gray, tan-weathering granulites containing thin coticule layers. Members 4, 5 and 6 are approximately equivalent to Ammonoosuc Volcanics. Member 3 is lithically similar to Monson and Fourmile Gneisses. Age in report is Ordovician. [Papers presented as chapters in U.S. Geological Survey Professional Paper 1366 are intended as explanations and (or) revisions to MA State bedrock geologic map of Zen and others (1983) at scale of 1:250,000.] Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

Lithology: Major:{gneiss,amphibolite}, Minor:{metavolcanic}, Incidental:{granulite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Shepard, Charles U. (1837): A Report on the Geological Survey of Connecticut. p. 137.
Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Hartford, Connecticut Bulletin 51.
Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York State. The Mineralogical Press, Danbury.
Crowley, William Patrick. (1968): The Bedrock Geology of the Long Hill and Bridgeport Quadrangles. State Geological and Natural History Survey of Connecticut, Quadrangle Report No. 24, p. 73.
Ryerson, Kathleen. (1976): Rock Hound's Guide to Connecticut. Pequot Press.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 397.


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