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
Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA


03646890017368861715061.jpg
Biotite, etc.

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
00860820017272026041868.jpg
Biotite

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
01263900017272011522537.jpg
Biotite, etc.

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
04976380017272011559879.jpg
Biotite

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
01263900017272011522537.jpg
Biotite, etc.

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
04976380017272011559879.jpg
Biotite

Big Rock Quarry, Granite Mountain area, Little Rock, Pulaski County, Arkansas, 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
Associated Minerals Based on Photo Data:
Titanite1
Chlorite Group1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Big Rock Quarry (3M Quarry; Arch Street Pike Quarry), Granite Mountain area, Little Rock, Pulaski County, Arkansas, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:45191
Long-form Identifier:1:3:45191:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
53.0km (32.9 miles) ⓘMarler Mine, Owensville, Saline County, Arkansas, USA
56.7km (35.2 miles) ⓘKimzey Calcite Quarry (Calcite Hill), Magnet Cove, Hot Spring County, Arkansas, USA
56.7km (35.2 miles) ⓘKimzey Magnetite Mine, Magnet Cove, Hot Spring County, Arkansas, USA
58.5km (36.4 miles) ⓘMagnet Cove Rutile Company deposits, Magnet Cove, Hot Spring County, Arkansas, USA
59.1km (36.7 miles) ⓘJones Mill Quarry, Magnet Cove, Hot Spring County, Arkansas, USA
59.1km (36.7 miles) ⓘMagnet Cove Baptist Church area, Magnet Cove, Hot Spring County, Arkansas, USA
59.6km (37.0 miles) ⓘPerryville carbonatite dike, Perry County, Arkansas, USA
59.7km (37.1 miles) ⓘDiamond Jo Quarry, Magnet Cove, Hot Spring County, Arkansas, USA
59.7km (37.1 miles) ⓘCove Creek Bridge and The Branch area, Magnet Cove, Hot Spring County, Arkansas, USA
59.8km (37.2 miles) ⓘPerovskite Hill, Magnet Cove, Hot Spring County, Arkansas, USA
References
Peacor, Donald R., Dunn, Pete J., Simmons, William B. (1984) Eggletonite, the Na analogue of ganophyllite. Mineralogical Magazine, 48 (346) 93-96 doi:10.1180/minmag.1984.048.346.12
Smith, Arthur E. Jr. (1997) Collecting Arkansas Minerals. L. R. Ream Publishing, Coeur d'Alene, ID.
 
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