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
Rattlesnake Mine, Gold-Pyrite Belt, Stafford County, Virginia, 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
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Rattlesnake Mine, Gold-Pyrite Belt, Stafford County, Virginia, USA
Data Identifiers
Mindat Occurrence Record ID:345170
Long-form Identifier:1:3:345170:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
31.9km (19.8 miles) ⓘCabin Branch Mine (Dumfries Mine), Dumfries, Gold-Pyrite Belt, Prince William County, Virginia, USA
41.9km (26.1 miles) ⓘSulphur Mine (Crenshaw Mine; Victoria Furnace Mine), Mineral, Gold-Pyrite Belt, Louisa County, Virginia, USA
42.7km (26.5 miles) ⓘCofer prospect (Piedmont Mineral Associates prospect), Gold-Pyrite Belt, Louisa County, Virginia, USA
43.9km (27.3 miles) ⓘBoyd-Smith Mine (Groome Mine; Lennig Mine; Smith Mine), Mineral, Gold-Pyrite Belt, Louisa County, Virginia, USA
44.9km (27.9 miles) ⓘVulcan Materials Company Crushed Stone Quarry (Manassas Quarry), Manassas, Prince William County, Virginia, USA
45.1km (28.1 miles) ⓘArminius Mine, Mineral, Gold-Pyrite Belt, Louisa County, Virginia, USA
51.7km (32.1 miles) ⓘFairfax Quarry, Centreville, Culpeper Basin, Fairfax County, Virginia, USA
61.9km (38.5 miles) ⓘWalker Mine, Louisa County, Virginia, USA
69.2km (43.0 miles) ⓘMoss Mine, Tabscott, Gold-Pyrite Belt, Goochland County, Virginia, USA
73.5km (45.7 miles) ⓘTellurium Vein, Scotia Mine (Perkins Mine), Gold-Pyrite Belt, Fluvanna County, Virginia, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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