Mica Group from Beaver County, Utah, USA
USA | |
| Collected by, and in the collection of Alex Earl |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Sainsbury, C. L. (1962) Mineralogical Notes: Helvite near Beaver, Utah. American Mineralogist, 47 (3-4) 395-398 | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |