mineral

Tumbled orange calcite

Calcite (CaCO₃)

AI-generated identification · may be incorrect

Likely translucent orange calcite with a vitreous to waxy polish; Mohs hardness 3, trigonal crystal system, and perfect rhombohedral cleavage. The smooth, rounded shape indicates tumbling; color may come from iron impurities.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary deposits, hydrothermal veins, and caves, commonly precipitating from calcium-rich water. The specimen’s geological age and source cannot be determined from the image.

Uses & applications

Used as a decorative and collector stone; calcite is also used in cement, lime, and agricultural applications, though this small polished piece is not industrial-grade.

Geological facts

Calcite effervesces in dilute acid and is strongly birefringent in clear varieties. Orange coloration is often due to trace iron or inclusions.

Field identification & locations

Look for its relatively low hardness, rhombohedral cleavage, and fizzing reaction with dilute acid; it occurs worldwide, including Mexico, the United States, and Brazil. The image alone cannot confirm the mineral identification.