Calcite from
Bolivia | |
| Alfredo Petrov, field trip observations, 2005. |
| Wilson, Wendell E. (2001) Notes From the Editors - Old Yuma mine. The Mineralogical Record, 32 (6) 426-501 |
| Hurlbut, C. S. Jr., Aristarain, L. F . (1969) Olsascherite, Pb2(SO4)(SeO4), anew mineral from Bolivia. American Mineralogist, 54 (11-12) 1519-1527 |
Bombori, Chayanta Province, Potosí, Bolivia