Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

East Village pegmatite, Monroe, Fairfield Co., Connecticut, USA

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 41° 21' 57'' North , 73° 11' 5'' West
Latitude & Longitude (decimal): 41.36583,-73.18472
Köppen climate type:Cfa : Humid subtropical climate

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.

Mineral List

9 valid minerals.

Rock Types Recorded

Note: this is a very new system on 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

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

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.]

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by 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.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 22, 2018 10:24:45 Page generated: December 21, 2017 16:43:33
Go to top of page