Muscovite from selected localities.
USA | |
| USGS Bull 945D; Butler, B. S. (1913) Geology and ore deposits of the San Francisco and adjacent districts, Utah. USGS Professional Paper 80. |
[var: Sericite] Butler, B. S. (1913) Geology and ore deposits of the San Francisco and adjacent districts, Utah. USGS Professional Paper 80. | |
| [var: Sericite] USGS Prof Paper 610 "Principal Gold Producing Districts of the United States" |
Cactus Mine, Preuss Mining District, San Francisco Mountains, Beaver County, Utah, USA