mineral
Yellow calcite
Calcite (CaCO₃), likely honey or amber calcite
AI-generated identification · may be incorrectTypically pale yellow to honey-orange, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.71. The specimen appears naturally cleaved or roughly broken rather than polished.
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Physical properties
Typically pale yellow to honey-orange, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.71. The specimen appears naturally cleaved or roughly broken rather than polished.
Formation & geological history
Forms when calcium-carbonate-rich groundwater precipitates in cavities, veins, caves, and sedimentary deposits; yellow coloration commonly comes from iron or other trace impurities. Calcite occurs from ancient Paleozoic rocks to modern cave and hydrothermal environments.
Uses & applications
Used in cement, lime, glass, agriculture, and chemical industries; attractive transparent pieces are collected or occasionally cut as decorative material, though it is too soft for most jewelry.
Geological facts
Calcite strongly effervesces with dilute hydrochloric acid and displays birefringence, producing doubled images through clear pieces. Yellow calcite is often confused with citrine, but calcite is much softer and cleaves readily.
Field identification & locations
Look for rhombohedral cleavage, low hardness, and acid fizz; common sources include Mexico, the United States, Brazil, and China. The photo supports yellow calcite, but exact identification would benefit from an acid or hardness test.
