Chalcedony from Namakwa District Municipality, Northern Cape, South Africa
South Africa | |
| Journal of African Earth Sciences Volume 21, Issue 1, July 1995, Pages 171-186 |
| Own collection XRD confirmed |
| Coetzee, C.B. (1976) Mineral Resources Of The Republic of South Africa, Handbook (fifth edition), for The Department of Mines, Geological Survey, page 405 |
Gamsberg zinc mine, Aggeneys, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa