mineral

Honey calcite (calcareous mineral specimen)

Calcite, CaCO₃; likely honey/yellow calcite with minor iron-oxide staining

AI-generated identification · may be incorrect

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.

Identified September 7, 2026More mineral →

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Physical properties

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.