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Manganocalcite on quartz crystals: from the Madan mine in Bulgaria (1995).
Stone dimensions: W: 95mm x H: 35mm x Weight: 420g.
Manganocalcite is a variety of calcite which owes its pink colour to the presence of manganese.
Chemical composition of manganocalcite: Manganese hydroxide MnO(OH) and calcium carbonate CaCO3.
Its hardness is 3-4 on the Mohs scale. Colour: pale pink.
