mineral

Tumbled orange calcite

Calcite (CaCO₃), likely orange variety

AI-generated identification · may be incorrect

Mohs hardness 3; translucent orange to honey-colored, vitreous-to-pearly luster, commonly rhombohedral cleavage, and variable white or gray veining. The irregular break surfaces and blocky cleavage are consistent with calcite, though image-only identification is provisional.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms through precipitation from carbonate-rich groundwater, hydrothermal fluids, or sedimentary limestone processes; specimens may range from ancient to geologically recent. Orange coloration commonly results from iron impurities or inclusions.

Uses & applications

Used as a decorative and collecting stone, ornamental carving material, and occasionally as crushed carbonate feedstock; generally unsuitable for jewelry subject to abrasion because of its softness.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid and can be scratched easily with a steel knife. It shows strong birefringence under transmitted light and commonly produces rhombohedral cleavage fragments.

Field identification & locations

Look for softness, rhombohedral cleavage, and acid reaction; distinguish from orange quartz or feldspar, which are harder and do not fizz. Common worldwide, especially in limestone, cave, hydrothermal, and vein deposits.