Talmessite on Calcite. This specimen of dolomite has crystals of hematite stained calcite upon which are deposited crystal sprays of talmessite to 4 mm across. Talmessite is a hydrated arsenate of calcium and magnesium. Ourlil, Bou Azzer, Anti Atlas Mts., Morocco. 4 x 3 x 2.3 cm

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