Quartz from Horn Silver Mine, Frisco, San Francisco Mining District, Beaver County, Utah, USA
USA | |
| [var. Chalcedony] Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey Butler, B. S. (1913) Geology and ore deposits of the San Francisco and adjacent districts, Utah. USGS Professional Paper 80. |