mineral

Green calcite (probable)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale yellow-green, translucent, and glassy to pearly with visible cleavage surfaces; Mohs hardness 3, trigonal crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71. The rough, irregular fragment is consistent with calcite, though color may also indicate another pale-green mineral.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in hydrothermal veins, limestone cavities, and sedimentary or metamorphic environments through precipitation from carbonate-rich fluids. Its age depends on the host deposit, ranging from recent cave growth to ancient Paleozoic or older rocks.

Uses & applications

Used in cement, lime, construction aggregate, soil treatment, and chemical manufacture; transparent or vividly colored pieces are collected as display minerals.

Geological facts

Calcite commonly effervesces strongly with dilute hydrochloric acid and shows double refraction in clear pieces. Green coloration can result from inclusions or trace elements.

Field identification & locations

Test cautiously with vinegar or dilute acid, inspect for rhombohedral cleavage, and compare its softness against a copper coin; common localities include Mexico, the United States, Iceland, and China.