mineral
Likely pale green calcite
Calcite (calcium carbonate, CaCO₃)
AI-generated identification · may be incorrectSoft (Mohs 3), pale mint-green to whitish, vitreous to pearly luster, translucent, and commonly rhombohedral with excellent rhombohedral cleavage. The rough, irregular broken surfaces are consistent with cleaved calcite, though image resolution limits certainty.
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Physical properties
Soft (Mohs 3), pale mint-green to whitish, vitreous to pearly luster, translucent, and commonly rhombohedral with excellent rhombohedral cleavage. The rough, irregular broken surfaces are consistent with cleaved calcite, though image resolution limits certainty.
Formation & geological history
Forms when calcium-rich groundwater precipitates in cavities, veins, limestones, and hydrothermal environments; specimens may range from ancient sedimentary deposits to recent cave or vein growth. Green coloration can result from trace minerals or inclusions.
Uses & applications
Used industrially for cement, lime, aggregate, soil treatment, and chemical manufacture; transparent colored crystals are collected and occasionally used decoratively rather than as jewelry due to softness.
Geological facts
Calcite strongly effervesces with dilute hydrochloric acid and commonly exhibits birefringence, producing doubled images through clear pieces. It is widespread worldwide, including Mexico, Iceland, the United States, and China.
Field identification & locations
Test carefully: a copper coin or fingernail may scratch it, and acid produces fizz; do not use acid on valuable specimens. Common localities include limestone caves, hydrothermal veins, and sedimentary rock quarries.
