mineral

Honey calcite (likely tumbled calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically translucent honey-yellow to amber, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, trigonal crystal system, and specific gravity about 2.71. The rounded shape and glossy surface indicate polishing or natural water-worn abrasion.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium-rich groundwater precipitates carbonate in cavities, veins, caves, and sedimentary rocks; many specimens are geologically young to Paleozoic or younger. The orange color commonly comes from iron impurities or inclusions.

Uses & applications

Used for cement, lime, aggregate, optical instruments, and ornamental stone; attractive transparent pieces are collected or cut as decorative gemstones. It is too soft for most durable jewelry.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, though vinegar may react slowly. It commonly shows double refraction: printed text viewed through a clear piece appears doubled.

Field identification & locations

Identify it by softness, rhombohedral cleavage, and acid reaction; common localities include Mexico, Iceland, the United States, and China. Avoid scratching it with steel and do not clean it with strong acids.