mineral

Yellow calcite (honey calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically honey-yellow to amber, translucent, with a vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal system, specific gravity about 2.71. The specimen appears naturally rounded or lightly polished, with cleavage-like fractures and whitish crusts.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms in limestone cavities, hydrothermal veins, and sedimentary environments when calcium-rich fluids precipitate carbonate; yellow color commonly results from iron or other trace impurities. Most examples are geologically young relative to their host rocks, ranging from recent deposits to Paleozoic and older formations.

Uses & applications

Used for cement, lime, aggregate, and chemical manufacture; transparent crystals are collectible, while attractive honey calcite is used for carvings and decorative pieces rather than durable jewelry.

Geological facts

Calcite effervesces vigorously in dilute hydrochloric acid or strong vinegar, unlike most look-alike quartz. It exhibits strong double refraction in clear pieces.

Field identification & locations

Common in Mexico, the United States, Canada, Iceland, and Europe; identify by very soft hardness, rhombohedral cleavage, and acid reaction. Avoid scratching polished surfaces when testing.