mineral
Honey calcite (calcareous mineral specimen)
Calcite, CaCO₃; likely honey/yellow calcite with minor iron-oxide staining
AI-generated identification · may be incorrectHardness 3 Mohs; translucent to opaque yellow, amber, cream, and white; vitreous to pearly luster; trigonal crystal structure with perfect rhombohedral cleavage. The stepped surfaces and easy cleavage are characteristic of calcite.
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Physical properties
Hardness 3 Mohs; translucent to opaque yellow, amber, cream, and white; vitreous to pearly luster; trigonal crystal structure with perfect rhombohedral cleavage. The stepped surfaces and easy cleavage are characteristic of calcite.
Formation & geological history
Forms when calcium-carbonate-rich groundwater precipitates in cavities, veins, or limestone deposits; yellow coloration commonly results from iron or organic impurities. Calcite is geologically widespread, ranging from ancient sedimentary formations to modern cave deposits.
Uses & applications
Used in cement, lime, aggregate, soil treatment, and chemical processing; attractive honey calcite is sold as a decorative or collecting specimen, but is generally too soft for durable jewelry.
Geological facts
Calcite strongly effervesces with dilute hydrochloric acid or vinegar, though a fresh surface gives the clearest reaction. It can show birefringence, producing doubled lettering when placed over printed text.
Field identification & locations
Common in limestone, marble, hydrothermal veins, and caves worldwide, including Mexico, the United States, Iceland, and China. Identify it by rhombohedral cleavage, low hardness, acid reaction, and possible double refraction.
