mineral

Orange-yellow calcite crystal

Calcite (CaCO₃), likely honey/orange calcite

AI-generated identification · may be incorrect

Mohs hardness 3; typically white to honey-orange, vitreous to pearly luster, translucent, and rhombohedral cleavage. The specimen appears to be a cleavage fragment or rough crystal with colored iron-oxide inclusions or zoning.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in hydrothermal veins, carbonate sediments, caves, and metamorphic environments; orange coloration commonly results from iron or other trace impurities. Its age depends on the host deposit, ranging from geologically recent cave growth to ancient Paleozoic or older mineralization.

Uses & applications

Used to manufacture cement, lime, and agricultural soil additives; attractive transparent crystals are collected and occasionally used decoratively. This small rough specimen has modest commercial value.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid and shows strong birefringence, producing doubled images through clear pieces. Its rhombohedral cleavage distinguishes it from similarly colored quartz, which is much harder and lacks cleavage.

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, and China. Test gently with a steel nail or copper coin for softness and use dilute acid only on an inconspicuous area; confirm orange calcite by cleavage and reaction.