Thaumasite (gemmy!)

N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa
Thumbnail, 0.6 x 0.3 x 0.3 cm
Start Time: 09/21/2017 6:45:00 pm (CDT)
End Time: 09/28/2017 6:45:00 pm (CDT)
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Item Description

A classic specimen of GEM QUALITY Thaumasite from the famous N'Chwaning Mines. This rare sulfate has a strange chemistry as it has carbonate, sulfate and hexahydroxysilicate anions in the same species. This thumbnail features a pastel-yellow, GEM Thaumasite crystal free of matrix. Originally, these pieces came out labeled as Ettringites, but it has now been shown they are the much rarer member of that series.

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