mineral

Raw pale-blue calcite (tentative)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Translucent pale blue-white, vitreous to pearly luster, blocky cleavage surfaces, and likely Mohs hardness 3; calcite is trigonal and has very low specific gravity (~2.71). The image alone cannot exclude pale blue fluorite or quartz.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms in hydrothermal veins, cavities, and carbonate sediments through precipitation from mineral-rich fluids; specimens may range from ancient to geologically recent. Blue coloration commonly reflects trace impurities or inclusions.

Uses & applications

Used industrially for cement, lime, aggregate, and chemical production; attractive crystals are collected, though this rough piece has little jewelry value.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid, unlike quartz and most fluorite. Its three directions of cleavage produce rhombohedral fragments.

Field identification & locations

Common in limestone and marble regions, hydrothermal veins, and geodes worldwide; test with acid and observe cleavage, but avoid scratching unless necessary. Common localities include Mexico, Iceland, the United States, and China.