Gypsum

Locality: DR Congo

Size: 74 mm x 60

Gypsum is a very diverse soft sulfate mineral composed of calcium sulfate dihydrate (CaSO₄ ⋅ 2H₂O) with a hardness of 2 on the Mohs scale. It forms naturally as an evaporate mineral in sedimentary basins, forming clear blade-like crystals. These from D R Congo has clay inclusions.

The Democratic Republic of Congo (DRC), previously known as Zaire, is a large central African country known to produce some of the most amazing Copper, Uranium and Cobalt minerals, to mention only a few.