mineral
Botryoidal calcite (likely honey calcite)
Calcite — calcium carbonate, CaCO₃
AI-generated identification · may be incorrectPale honey-yellow, translucent, and botryoidal (grape-like) with a glassy to pearly luster; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71.
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Physical properties
Pale honey-yellow, translucent, and botryoidal (grape-like) with a glassy to pearly luster; Mohs hardness 3, rhombohedral crystal structure, perfect rhombohedral cleavage, and specific gravity about 2.71.
Formation & geological history
Forms when calcium-rich groundwater precipitates carbonate in cavities, veins, caves, or hydrothermal environments; individual specimens may range from recent deposits to Paleozoic or younger host-rock ages.
Uses & applications
Used for cement, lime, aggregate, and chemical production; attractive specimens are collected as display minerals, though this small piece has limited gem use.
Geological facts
Calcite effervesces strongly with dilute hydrochloric acid or vinegar, although vinegar may react slowly. Its rhombohedral cleavage and double refraction are diagnostic.
Field identification & locations
Common worldwide in limestone, marble, geodes, and mineral veins, including Mexico, Brazil, the United States, and China. Identify by its softness, carbonate reaction, cleavage, and pale yellow botryoidal form; exact color and locality require testing or provenance.
