mineral

Tumbled honey calcite

Calcite (CaCO₃), likely iron-stained variety

AI-generated identification · may be incorrect

Translucent cream to honey-brown, with vitreous to pearly luster and prominent cleavage surfaces; Mohs hardness 3, rhombohedral crystal structure, and specific gravity about 2.71. The irregular polished shape and layered translucency are consistent with calcite rather than quartz.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms by precipitation from carbonate-rich groundwater, hydrothermal fluids, caves, and sedimentary environments; iron impurities create the golden coloration. Specimen age depends on its host deposit and cannot be determined from the image.

Uses & applications

Used for cement, lime, agricultural soil treatment, optical instruments, and acid neutralization; attractive transparent pieces are sold as décor or inexpensive mineral specimens. Typical value is about $3–$20 for a small polished piece, higher for exceptional clarity or provenance.

Geological facts

Calcite effervesces visibly in dilute hydrochloric acid or strong vinegar, unlike quartz. It commonly shows rhombohedral cleavage and can produce striking double refraction through clear sections.

Field identification & locations

Commonly found in limestone, marble, hydrothermal veins, and cave deposits worldwide, especially Mexico, Iceland, the United States, and China. Confirm with a hardness test against a copper coin or steel blade and an acid reaction; avoid damaging valuable specimens.