Feldspar Group from selected localities.
USA | |
| [var: Perthite] USGS Prof Paper 297F |
[var: Perthite] Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E. | |
SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills" | |
| [var: Perthite] USGS Prof Paper 297F |