mineral

Tumbled orange calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Likely pale honey-orange calcite with a vitreous to waxy luster and translucent edges; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71. The smoothly polished, blocky shape suggests a tumbled or cut specimen.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, hydrothermal veins, caves, and carbonate-rich metamorphic rocks. It may range from modern precipitates to rocks hundreds of millions of years old; the specimen’s age cannot be determined visually.

Uses & applications

Used in cement, lime, aggregate, soil treatment, and optical instruments; attractive orange material is sold as a low-cost collecting, décor, or metaphysical stone.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, though vinegar may react slowly. It shows strong birefringence: text viewed through a clear piece can appear doubled.

Field identification & locations

Common localities include Mexico, the United States, Iceland, and China. Confirm with a hardness test and acid reaction; avoid scratching polished surfaces.