N'Chwaning II Mine!
Poldervaartite is an extremely rare mineral and one of the rarest minerals from the Kalahari manganese fields near Kuruman, South Africa. Poldrvaartite is a type-locality mineral of the Kalahari manganese mines, and this is the only area it has been found in the world. It is a fairly new mineral species, being first reported in 1993. It was first discovered at the Wessels mine. At first it was thought to only have occurred once but subsequently 6 occurrences have been documented, including this one at the famous N'Chwaning II Mine. It was named after Arie Poldervaart of Columbia University. It is an Acid Nesosilicate with the chemical formula of CaO.5MnO.5), and has been found in association with Henritermite, calcite, bultfonteinite and hematite.
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Size: 2 X 1 X 0.75 inches
Size: 1.25 X 1 X 0.75 inches
Size: 1.75 X 1 X 0.75 inches