Hypersthene from Oregon, USA
USA | |
| Oregon Metal Mines Handbook, 1943, Oregon Department of Geology and Mineral Industries: Bulletin No. 14-C, Vol. 2, Section 2 - Jackson Co., page 60. |
| Howard, D. G. (2008): [Title]. International Micromounters Journal, 15 (3 & 4), 3-6. |
Summit Rock, Klamath County, Oregon, USA