mineral

Honey calcite crystal cluster

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, transparent to translucent, and rhombohedral cleavage; this specimen is pale honey-yellow to colorless with blocky, cleaved crystals. Calcite effervesces strongly in dilute hydrochloric acid and has specific gravity about 2.71.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms commonly from carbonate-rich groundwater, hydrothermal fluids, and sedimentary limestone environments; the specimen likely crystallized in a cavity or vein, with coloration caused by impurities such as iron. Calcite occurs from ancient to modern geological settings.

Uses & applications

Used in cement, lime, aggregate, soil treatment, chemical processing, and optical instruments; attractive transparent clusters are collected as display minerals, though calcite is generally too soft for durable jewelry.

Geological facts

Calcite has three perfect cleavage directions and exhibits strong birefringence, producing double images when viewed through clear crystals. Honey coloration can fade with prolonged sunlight or heat.

Field identification & locations

Common worldwide, especially in Mexico, the United States, Iceland, England, and China; identify by rhombohedral cleavage, low hardness, and acid reaction. Avoid scratching or acidic cleaners.