mineral
Yellow calcite
Calcite, CaCO₃
AI-generated identification · may be incorrectPale yellow, translucent to opaque fragment with a vitreous to pearly luster; Mohs hardness 3, trigonal crystal system, and perfect rhombohedral cleavage. The small fragment’s identity is uncertain from the image alone.
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Physical properties
Pale yellow, translucent to opaque fragment with a vitreous to pearly luster; Mohs hardness 3, trigonal crystal system, and perfect rhombohedral cleavage. The small fragment’s identity is uncertain from the image alone.
Formation & geological history
Calcite forms in sedimentary deposits, hydrothermal veins, and cavities in rocks; it can also precipitate from biological activity. It occurs from ancient rocks to modern deposits.
Uses & applications
Used in cement, lime, and construction materials; attractive colored or crystalline specimens are collected and sometimes used decoratively.
Geological facts
Calcite fizzes in dilute hydrochloric acid and is strongly birefringent in clear crystals.
Field identification & locations
Look for its softness, cleavage into rhombohedral pieces, and acid reaction; yellow coloration may come from trace impurities. Calcite is widespread worldwide, including limestone and marble regions.
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