Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Muscovite from
Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA


Locality type:Mine
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Formation:Primary
Comments:Shannon (1920) reports "Occasional crystals of muscovite, which occur in the cleavelandite, are penetrated by flat opaque crystals of green tourmaline." These can be very aesthetic specimens. Cameron et al (1954) note the presence of muscovite books 2 to 18 inches broad and ¼ to 4 inches thick in wall zone of the pegmatite, which was the focus of WWII-era mining.
Habit:anhedral tabular
Colour:silvery to yellowish/rum
Abundance at site:Very common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Elbaite4
Quartz4
- var Smoky Quartz1
Albite4
- var Cleavelandite2
Tantalite-(Mn)2
Lepidolite2
Almandine1
Monazite-(Ce)1
Beryl1
Columbite-(Fe)-Columbite-(Mn) Series1
Triplite1
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Anderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:37799
Long-form Identifier:1:3:37799:3
GUID (UUID V4):0
Nearest other occurrences of Muscovite
0.1km (0.1 miles) ⓘAnderson No. 2 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
0.3km (0.2 miles) ⓘBailey prospect, East Hampton, Middlesex County, Connecticut, USA
0.4km (0.3 miles) ⓘEnegren Mica Mine, East Hampton, Middlesex County, Connecticut, USA
0.9km (0.6 miles) ⓘRock Landing Quarry (Capt. Rohrback Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘHurd State Park quarries, East Hampton, Middlesex County, Connecticut, USA
1.6km (1.0 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
1.7km (1.0 miles) ⓘKnudsen prospects, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.7km (1.1 miles) ⓘHalberg Quarries (Eureka Quarry; Cook Quarry; Gem Stone Quarry), East Hampton, Middlesex County, Connecticut, USA
1.9km (1.2 miles) ⓘFeldspar quarry, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
2.0km (1.2 miles) ⓘTidewater feldspar quarry, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
References
USGS Professional Paper 255.
Shannon, Earl V. (1920) The old lithia mine in Chatham, Connecticut. American Mineralogist, 5 (4) 82-84
Cameron, Eugene N., Larrabee, David M., McNair, Andrew H., Page, James J., Stewart, Glen W., Shainin, Vincent E. (1954) Pegmatite Investigations, 1942-45, in New England. Geological Survey Professional Paper 255. US Geological Survey doi:10.3133/pp255
 
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