Topaz from Yavapai County, Arizona, USA
USA | |
| Wilson, E.D. (1941), Arizona Bureau of Mines Bull. 148: 24. |
| Schmitz, Christopher, and DONALDM BURT. "The Black Pearl mine, Arizona- Wolframite veins and stockscheider pegmatite related to an albitic stock." Global catastrophes in Earth history. Boulder, CO, Geological Society of America(Geological Society Special Publication, 247 (1990): 221-232. |