mineral

Raw yellow calcite

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale yellow, translucent-to-opaque, with a vitreous to pearly luster and irregular cleavage surfaces; Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.71. The specimen may also be yellow aragonite or a calcite-rich fragment, but calcite is the best visual match.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms in limestone, hydrothermal veins, caves, and evaporite environments through precipitation from carbonate-rich fluids; specimens may range from modern deposits to rocks hundreds of millions of years old.

Uses & applications

Used to manufacture cement, lime, aggregates, and agricultural soil amendments; clear or well-crystallized pieces are collected, though this small rough fragment has limited commercial value.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or vinegar, especially when powdered or freshly scratched. It commonly shows rhombohedral cleavage and can display birefringence through transparent pieces.

Field identification & locations

Common worldwide, including Mexico, the United States, Iceland, and China. Identify it by its softness, rhombohedral cleavage, and acid reaction; avoid prolonged vinegar testing if preservation matters.