Muscovite from Caribou County, Idaho, USA
USA | |
| [var. Illite] Gulbrandsen, R. A. (1974). Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho. US Geological Survey Journal of Research, 2, 693-697. |
USA | |
| [var. Illite] Gulbrandsen, R. A. (1974). Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho. US Geological Survey Journal of Research, 2, 693-697. |