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Orthoclase from
Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA

Locality type:Peak
Classification
Species:Orthoclase
Formula:K(AlSi3O8)
Confirmation
Validity:Believed Valid
References
References:SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
Data
Mineral Data:Click here to view Orthoclase data
Locality Data:Click here to view Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA
Nearest other occurrences of Orthoclase
7.0km (4.4 miles) Twin Peaks, Lead Mining District, Lawrence Co., South Dakota, USA
9.3km (5.8 miles) Wharf Mine, Bald Mountain Mining District (Portland Mining District), Lawrence Co., South Dakota, USA
11.0km (6.8 miles) Homestake Mine, Lead, Lead Mining District, Lawrence Co., South Dakota, USA
11.3km (7.0 miles) Terry, Lawrence Co., South Dakota, USA
18.2km (11.3 miles) Gilt Edge Mine (Rattlesnake Jack; Dakota Maid; Ruby Ridge; Gilt Edge Glory Hole; Oro-Fina; Anchor Hill Mines 0460810072), Galena, Galena Mining District, Lawrence Co., South Dakota, USA
19.4km (12.1 miles) Bear Den Mountain, Galena, Galena Mining District, Lawrence Co., South Dakota, USA
67.9km (42.2 miles) Black Elk Peak (Harney Peak), Pennington Co., South Dakota, USA
70.4km (43.7 miles) Etta Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA
71.1km (44.2 miles) Hugo Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA
 
Mineral and/or Locality  
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