mineral

Orange calcite

Calcite (CaCO₃)

AI-generated identification · may be incorrect

Likely a rough, translucent orange calcite specimen with a vitreous to pearly luster and prominent cleavage. Calcite has Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.7; orange color commonly comes from iron-related impurities. The photo alone cannot confirm the identification.

Identified October 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when calcium carbonate precipitates from groundwater or hydrothermal fluids, and in limestone and marble. Calcite occurs in rocks of many geological ages.

Uses & applications

Used in cement, lime, and other industrial products; attractive orange specimens are collected and sometimes used decoratively, though this piece appears unsuitable for jewelry requiring durability.

Geological facts

Calcite effervesces in dilute acid and has perfect rhombohedral cleavage; its double refraction is especially visible in clear crystals.

Field identification & locations

The orange color and blocky cleavage are consistent with orange calcite; a drop of dilute acid fizzing on a fresh surface can help distinguish it from lookalikes. Calcite is widespread worldwide, including limestone regions and hydrothermal veins.