mineral
Honey calcite crystal
Calcite, calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectTypically pale honey-yellow to orange, transparent to translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal structure, specific gravity about 2.71.
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Physical properties
Typically pale honey-yellow to orange, transparent to translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal structure, specific gravity about 2.71.
Formation & geological history
Forms through precipitation from carbonate-rich groundwater, hydrothermal fluids, or sedimentary cavities; specimens may range from recent cave growth to Paleozoic or younger host-rock deposits.
Uses & applications
Used for cement, lime, agricultural soil treatment, and chemical manufacture; attractive transparent crystals are sold as decorative or educational specimens, but are generally inexpensive.
Geological facts
Calcite strongly effervesces in dilute hydrochloric acid and shows pronounced birefringence, producing doubled images through clear pieces.
Field identification & locations
Common in limestone, marble, geodes, veins, and caves worldwide, including Mexico, Iceland, the United States, and China. Identify it by its rhombohedral cleavage, softness, and acid reaction; the orange color may reflect iron or other impurities.
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