THAUMASITE

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A superb, gemmy colourless prismatic Thaumasite, from the N'Chwaning mines in South Africa. Thaumasite is a rare and complex calcium silicate which includes a carbonate component a nd sometimes a sulphite. This 2.6 x 2.2 x 1.5 cm cluster of crystals, although colourless, does contain a hint of yellowish-green and is attached to a thin patchy crust of chocolate brown siliceous matrix. About eight Thaumasite crystals make up this large thumbnail, the largest by far being 1.8 x 1.0 x 0.8 cm. All the crystals are transparent and contain many gemmy zones plus patches of iridescent interference colours within the prism bodies. This is a well crystallised specimen of Thaumasite from the N'Chwaning mines within the Kalahari Manganese Field. Show more