mineral

Red calcite

Calcite (CaCO₃), likely iron- or manganese-colored

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, white streak, excellent rhombohedral cleavage, and specific gravity about 2.71. This specimen is translucent orange-red with fibrous/cleavable texture and iron-stained surfaces.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, cavities, and carbonate-rich sedimentary environments when calcium-bearing fluids precipitate calcite. Its exact geological age cannot be determined from the photograph; calcite deposits range from ancient to modern.

Uses & applications

Used in cement, lime, aggregate, chemical processing, and optical calcite research; attractive colored crystals are collected as mineral specimens. It is generally unsuitable for jewelry because of softness and cleavage.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid or household vinegar, especially on a freshly scratched surface. Red coloration may result from iron oxides, manganese, or inclusions rather than pure calcite chemistry.

Field identification & locations

Look for rhombohedral cleavage, low hardness, and acid reaction; it should scratch easily with a steel knife and not glass. Common localities include Mexico, the United States, China, Romania, and Morocco.