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Orthoclase from
Etta Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA

Locality type:Mine
Classification
Species:Orthoclase
Formula:K(AlSi3O8)
Comments:Occurs in a lithia pegmatite.
Confirmation
Validity:Believed Valid
References
References:Dana 6: 1088; Rocks & Minerals: 10: 121-122,146-147.; USGS Bull 380D
Data
Mineral Data:Click here to view Orthoclase data
Locality Data:Click here to view Etta Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA
Nearest other occurrences of Orthoclase
1.2km (0.7 miles) Hugo Mine, Keystone, Keystone Mining District, Pennington Co., South Dakota, USA
9.2km (5.7 miles) Black Elk Peak (Harney Peak), Pennington Co., South Dakota, USA
54.0km (33.5 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
54.7km (34.0 miles) Bear Den Mountain, Galena, Galena Mining District, Lawrence Co., South Dakota, USA
59.6km (37.0 miles) Terry, Lawrence Co., South Dakota, USA
59.6km (37.1 miles) Homestake Mine, Lead, Lead Mining District, Lawrence Co., South Dakota, USA
61.9km (38.4 miles) Wharf Mine, Bald Mountain Mining District (Portland Mining District), Lawrence Co., South Dakota, USA
65.7km (40.8 miles) Twin Peaks, Lead Mining District, Lawrence Co., South Dakota, USA
70.4km (43.7 miles) Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA
 
Mineral and/or Locality  
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