Muscovite from Malheur County, Oregon, USA
USA | |
| [var. Sericite] (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
[var. Illite] Altaner, S.P., Grim, R.E. (1990) Mineralogy, chemistry, and Diagenesis of tuffs in the Sucker Creek Formation (Miocene), eastern Oregon. Clays & Clay Minerals 38:6, 561-572. |