Calcite (blue)

Calcium carbonate
Crestmore Quarry, Riverside County, CA

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Metamorphic Rocks and Minerals

Blue calcite is a calcium carbonate mineral distinguished by its soft blue coloration, a result of trace mineral inclusions during formation. Though calcite is common worldwide, blue calcite is relatively rare and often forms in marble and other metamorphosed limestone deposits. At Crestmore Quarry in Riverside County, California, this striking variety of calcite is well known among collectors for its aesthetic appeal and provides insight into the region’s complex geological history.

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