mineral
Yellow calcite (likely)
Calcite, CaCO₃
AI-generated identification · may be incorrectHoney-yellow, translucent to opaque rough fragment with a vitreous-to-waxy luster; calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage. The photo alone cannot confirm the identification.
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Physical properties
Honey-yellow, translucent to opaque rough fragment with a vitreous-to-waxy luster; calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage. The photo alone cannot confirm the identification.
Formation & geological history
Calcite forms in sedimentary settings, hydrothermal veins, and cavities in limestone; it occurs from ancient rocks to modern deposits. Yellow color commonly comes from trace impurities.
Uses & applications
Used in cement and lime production, soil treatment, and as a decorative or collecting mineral; attractive pieces may be cut or polished.
Geological facts
Calcite effervesces in dilute hydrochloric acid and is readily scratched by a copper coin or knife. Double refraction is conspicuous in clear crystals.
Field identification & locations
Compare its soft hardness and rhombohedral cleavage with other yellow minerals; common sources include limestone regions and hydrothermal deposits worldwide. A small rough specimen like this is typically worth about $1–$10 USD.
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