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
Arnold Granite Quarry (General Brainerd Quarry; Great Hill Quarry; Hazelton Quarry; Haddam Quarry; Brookes Quarry), Haddam, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Arnold Granite Quarry (General Brainerd Quarry; Great Hill Quarry; Hazelton Quarry; Haddam Quarry; Brookes Quarry), Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:664167
Long-form Identifier:1:3:664167:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.4km (0.3 miles) ⓘJail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA
1.5km (0.9 miles) ⓘTimms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA
2.5km (1.5 miles) ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA
3.1km (1.9 miles) ⓘState Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA
5.0km (3.1 miles) ⓘBailey prospect, East Hampton, Middlesex County, Connecticut, USA
6.7km (4.1 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
8.9km (5.5 miles) ⓘJohn Salak Quarry, Haddam, Middlesex County, Connecticut, USA
11.3km (7.0 miles) ⓘLyman Viaduct at Dickinson Creek, Westchester, Colchester, New London County, Connecticut, USA
11.8km (7.3 miles) ⓘLinkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA
12.3km (7.6 miles) ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA
References
Williams (circa 1945)
 
and/or  
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