Feldspar Group from selected localities.
USA | |
| [var: Perthite] Redden, Jack Allison (1959) Beryl deposits of the Beecher No.3 Black Diamond pegmatite, Custer County, South Dakota. USGS Bulletin: 1072- |
[var: Perthite] U.S. Geological Survey Professional Paper 297 | |
[var: Perthite] USGS Prof Paper 297F | |
[var: Perthite] Am Min (1946), 31:192 | |
[var: Perthite] [MinRec 4:111, 4:131-136] | |
[var: Perthite] U.S. Geological Survey Professional Paper 297 | |
[var: Perthite] USGS Prof Paper 297F |