mineral

Raw yellow calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Typically pale yellow to honey-colored with a glassy-to-pearly luster; Mohs hardness 3, excellent rhombohedral cleavage, and generally translucent. The irregular cleavage surfaces and soft appearance are consistent with calcite, though image-only identification is tentative.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms in limestone, hydrothermal veins, caves, and sedimentary environments through precipitation from calcium-rich fluids. Calcite occurs from ancient to modern geological ages and is widespread worldwide.

Uses & applications

Used extensively in cement, lime, aggregate, soil treatment, and chemical production; attractive transparent or colorful crystals are sold as inexpensive collector specimens.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, unlike many similar yellow minerals. It is commonly fluorescent under ultraviolet light depending on impurities.

Field identification & locations

Common localities include Mexico, Iceland, the United States, China, and Peru. Confirm with a hardness test, rhombohedral cleavage, and acid reaction; avoid testing valuable specimens directly.