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Biotite from
Homestake Mine, Lead, Lead Mining District, Lawrence Co., South Dakota, USA

Locality type:Mine
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
References
References:South Dakota SMT Bull. 18 Roberts and Rapp "Mineralogy of the Black Hills"
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Homestake Mine, Lead, Lead Mining District, Lawrence Co., South Dakota, USA
Nearest other occurrences of Biotite
25.0km (15.5 miles) Montezuma Mine (Montezuma Nos. 3 to 7; Red Jim; New Montezuma), Rochford Mining District, Pennington Co., South Dakota, USA
26.1km (16.2 miles) Mary Belle Mine, Rochford Mining District, Pennington Co., South Dakota, USA
49.4km (30.7 miles) Hill City Mining District, Pennington Co., South Dakota, USA
52.1km (32.4 miles) Gold Medal Group (Golden Summit Group), Hill City Mining District, Pennington Co., South Dakota, USA
53.9km (33.5 miles) U.S. highways 16/385 & State route 87 intersection area, Oreville Mining District, Pennington Co., South Dakota, USA
54.8km (34.0 miles) Reinbold Claim (Tungsten No. 1-3 Claims), Hill City Mining District, Pennington Co., South Dakota, USA
55.7km (34.6 miles) Oreville, Custer Co., South Dakota, USA
56.0km (34.8 miles) Tin Queen Mine (White Blowout Mine), Hill City Mining District, Pennington Co., South Dakota, USA
57.1km (35.5 miles) Egyptian Group, Keystone Gold Mining District, Pennington Co., South Dakota, USA
57.4km (35.7 miles) Dan Patch Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA
 
Mineral and/or Locality  
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