Calcite on banded Ironstone (Wessels Mine, South Africa)
Wessels Mine, Kalahari Manganese Fields, South Africa. 90mm x 40mm x 20mm.
Snow white Calcites cover the top of the specimen, the banded Ironstone has little veins of Pyrite running through it and closer examination will show the small pyrites formed first with the Calcite covering them at a later stage. This is a interesting specimen from the Wessels mine.