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www.mineralgallery.co.za Minerals P-T |
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Poldervaartite |
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Name
Poldervaartite
Chemistry
Ca(CaO.5MnO.5) Acid Nesosilicate
Uses
As a mineral specimen
Color
Colorless or white, also blue, green, yellow and red shades.
Hardness
4.5 - 5.3
Specific gravity
3.2
Crystals
The crystals can form wheatsheaf bundles that are very attractive.
Accompanied by:
Bultfonteinite, Calcite, Hematite, Henritermite
Fracture
Uneven
Luster
Vitreous
Cleavage
None.
Streak
White
Similar to:
Bultfonteinite
One of the new minerals from the Kalahari manganese fields
Poldervaartite is a type-locality mineral from the Kalahari manganese mines. This means that it was only found here. It was only reported in 1993, which makes it a relatively new mineral in the mineral world, this also means that it is an unknown mineral. It was discovered at the Wessels mine. At first it was thought to only have occurred once but subsequently 6 occurrences have been documented.
It was named after Arie Poldervaart of Columbia University.
Recently a new find was discovered and the pocket is now mined out.
