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Pyrrhotite with Calcite from Russia

Calcite

Calcite

calcite.

Calcite

pink calcite

Orange Calcite Crystal Tree

Calcite

Calcite

Amethyst with Calcite

Calcite

Calcite on Amethyst

Elbaite with Quartz from Brazil  by Dan Weinrich

calcite crystal, from Sweden

Hematite Calcite crystal

Calcite and pyrite

Calcite included by Aurichalcite from Mexico

Fluorite on Calcite

calcite with chalcopyrite

Water-clear Calcite from Russia

Barite on Calcite