Chalcedony from
South Africa | |
| Anhaeusser, C.R., (1978) The Geology And Geochemistry Of The Muldersdrif Ultramafic Complex, Krugersdorp District. Economic Geology Research Unit, University Of The Witwatersrand Johannesburg. Information Ciruclar No. 117 |
| Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, Linden . |
| Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, Linden . |