Calcite and Stibnite Cluster Specimen - China 7x3” Tourmaline Often associated with the Sacral

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Calcite and Stibnite Cluster Specimen - China 7x3” Tourmaline Often associated with the SacralThis cluster is a fantastic combination of Calcite and Stibnite showcasing a gorgeous swirl pattern throughout the specimen. This Calcite and Stibnite Cluster also exhibits a sparkle of rare coloring of greys and creams. Frm Nandon China. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite". How is calcite formed?