mineral

Green calcite (likely)

Calcite, CaCO₃

AI-generated identification · may be incorrect

Pale mint-green, translucent, with a vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3 and specific gravity about 2.71. The irregularly faceted piece appears rough-cut or naturally cleaved.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in hydrothermal veins, carbonate rocks, caves, and sedimentary deposits; green color commonly comes from inclusions or trace elements. Its age depends on the host deposit, ranging from recent cave growth to ancient Paleozoic or older rocks.

Uses & applications

Commonly collected as a decorative mineral; calcite is also used industrially for cement, lime, construction aggregate, and chemical applications, though this small specimen has little practical value.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid or strong vinegar and shows birefringence under clear, polished surfaces. Color alone is not diagnostic because calcite occurs in many colors.

Field identification & locations

Likely calcite if it scratches easily with a steel knife and reacts to acid; fluorite or glass are alternatives without testing. Common localities include Mexico, the United States, Iceland, and China.