Gemmology
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Calcite — specimens [gallery view]


A major rock-forming mineral; in limestones, marbles, a common cement in sedimentary rocks, and as gangue in hydrothermal veins; in alkalic to mafic igneous rocks; common as speleothems in caves (Anthony et al., 2001—2005). There are specimens of 4440 carats (Arem, 1987: 60).
Calcite — specimen 0192
0192
Thailand
Calcite — specimen 0254
0254
Thailand
Calcite — specimen 0433
0433
Kazakhstan
Marble — specimen 0613
0613
no precise locality

Calcite — specimens — 4
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