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These stunning red rhodochrosite crystals are made of manganese carbonate.

Rhodochrosite | #Geology

Formula: MnCO3
System: Trigonal
Colour: Pink, rose, red, ...
Lustre: Vitreous, Pearly
Hardness: 3½ - 4
Tenacity: Brittle

From N'Chwaning Mine, Northern Cape Province, South Africa.
Credit: Heritage Auctions

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