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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Biotite from
Bristol Copper Mine, Bristol, Hartford County, Connecticut, USA


Locality type:Mine
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Bristol Copper Mine, Bristol, Hartford County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:41254
Long-form Identifier:1:3:41254:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
11.0km (6.9 miles) ⓘLead Mine Brook, Harwinton, Litchfield County, Connecticut, USA
15.2km (9.4 miles) ⓘWaterbury Road quarry, Thomaston, Litchfield County, Connecticut, USA
16.4km (10.2 miles) ⓘState Routes 8 and 118 interchange, Harwinton, Litchfield County, Connecticut, USA
18.8km (11.7 miles) ⓘRatlum Mountain, Canton, Hartford County, Connecticut, USA
19.6km (12.2 miles) ⓘRoute 73 quarry, Waterbury, New Haven County, Connecticut, USA
19.7km (12.3 miles) ⓘMountain Top Trucking quarry, Torrington, Litchfield County, Connecticut, USA
20.0km (12.5 miles) ⓘInterstate 84 interchange 26, Cheshire, New Haven County, Connecticut, USA
21.1km (13.1 miles) ⓘProgress Lane construction site, Waterbury, New Haven County, Connecticut, USA
28.3km (17.6 miles) ⓘNonnewaug River Industrial Park, Woodbury, Litchfield County, Connecticut, USA
28.3km (17.6 miles) ⓘMount Prospect complex (Prospect Hill complex; Prospect Mountain complex), Litchfield, Litchfield County, Connecticut, USA
References
Wilson, Wendell E. (2001) Notes From the Editors - Old Yuma mine. The Mineralogical Record, 32 (6) 426-501pp.433-433
 
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