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MD-188266
Thaumasite
Thumbnail, 1.4 x 0.9 x 0.7 cm
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
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Thaumasite is a rare member of the ettringite group, seen in its best gemmy crystals from the N'Chwaning Mine - where this thumbnail is from. This little crystal is doubly-terminated, with a cluster of little sidecar crystals sticking off the side.