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Is a manganese carbonate mineral with formula MnCO3 . Very rare in gem quality, mostly is found in parallel or concentric layers (stalactite) as hydrothermal deposit; today the biggest production comes from old abandoned silver mines in Capillitas,Catamarca,Argentina. His hardness is low: 3.5-4 therefore must handle with care and avoid acid.
This stone is hand polished on both side.
Size: 29x18x4.2 mm.
Weight: 23.78 ct.