mineral
Tumbled yellow calcite
Calcite (calcium carbonate, CaCO₃)
AI-generated identification · may be incorrectTypically pale yellow to honey-colored, translucent to opaque, with a vitreous-to-pearly luster and cloudy banding. Mohs hardness 3; rhombohedral crystal system and perfect rhombohedral cleavage, though tumbling has rounded the surface.
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Physical properties
Typically pale yellow to honey-colored, translucent to opaque, with a vitreous-to-pearly luster and cloudy banding. Mohs hardness 3; rhombohedral crystal system and perfect rhombohedral cleavage, though tumbling has rounded the surface.
Formation & geological history
Forms in limestone, marble, hydrothermal veins, caves, and evaporite environments through precipitation or alteration. Calcite occurs from ancient Precambrian rocks to modern cave deposits; this specimen is human-tumbled.
Uses & applications
Used in cement, lime, construction aggregate, glass manufacture, soil treatment, and chemical industries; attractive pieces are sold as decorative or metaphysical specimens.
Geological facts
Calcite effervesces vigorously in cold dilute hydrochloric acid and may fluoresce under ultraviolet light. Its rhombohedral cleavage and low hardness distinguish it from harder yellow quartz varieties.
Field identification & locations
Common worldwide, especially in limestone regions, Mexico, the United States, Iceland, and China. A likely identification is confirmed if it scratches easily with a steel knife and reacts with dilute acid; visual identification alone cannot exclude yellow aragonite or dyed material.
