mineral
Raw yellow calcite
Calcite, calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectPale 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.
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Physical properties
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.
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.
