mineral

Honey calcite (yellow calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically golden-yellow to honey-brown, translucent, and vitreous to pearly, with prominent rhombohedral cleavage; Mohs hardness 3 and specific gravity about 2.71. The irregular white zones are likely milky calcite or surface alteration.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-rich groundwater precipitates in cavities, veins, limestones, and hydrothermal deposits; specimens may range from recent formations to Paleozoic or older host-rock ages. Common sources include Mexico, Brazil, Iceland, and the United States.

Uses & applications

Used industrially for cement, lime, glass, agricultural soil treatment, and chemical manufacture; attractive transparent pieces are collected or fashioned into decorative objects, though this specimen appears mainly ornamental.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid and commonly produces birefringence (“double refraction”) in clear pieces. Its rhombohedral cleavage distinguishes it from similarly colored quartz, which is harder and lacks cleavage.

Field identification & locations

Identify by its softness, cleavage, and acid reaction; a copper coin or knife can scratch it, while quartz cannot. Confirm with a streak and acid test, preferably on an inconspicuous area.