mineral

Polished orange calcite

Calcite (calcium carbonate, CaCO₃), likely banded honey/orange calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to waxy luster, orange-yellow color with pale bands, and rhombohedral cleavage; the rounded shape indicates tumbling or polishing. It may fizz in dilute hydrochloric acid or vinegar, though vinegar’s reaction can be weak.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, hydrothermal veins, and cavities, with orange color commonly caused by iron or other trace impurities. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Used for cement, lime, construction aggregate, soil treatment, and industrial calcium carbonate; attractive banded pieces are sold as ornamental or lapidary material. It is generally inexpensive and unsuitable for durable jewelry because of its softness.

Geological facts

Calcite is strongly birefringent: clear pieces can show doubled images. It is one of the most common minerals and a major component of limestone and marble.

Field identification & locations

Look for very low hardness, rhombohedral cleavage, and acid effervescence; it can be scratched by a copper coin or steel knife. Common worldwide, especially in limestone regions and hydrothermal deposits.