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calcite...beautiful wow!

Cranberry Fluorite crystals covered with Calcite crystals, Anhui Province, China, 1" / Mineral Friends ♥

Aragonite is a carbonate mineral, one of the two common, naturally occurring, crystal forms of calcium carbonate, CaCO3 (the other form being the mineral calcite). It is formed by biological and physical processes, including precipitation from marine and freshwater environments. [Aragonite Tree, Kuratahi Cave Puketiti. New Zealand]