mineral
Calcite crystal cluster
Calcite, CaCO₃
AI-generated identification · may be incorrectCream to honey-colored, translucent to opaque crystals with a vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3. The blocky crystal shapes and pale color are consistent with calcite, though identification from the image alone is not definitive.
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Physical properties
Cream to honey-colored, translucent to opaque crystals with a vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3. The blocky crystal shapes and pale color are consistent with calcite, though identification from the image alone is not definitive.
Formation & geological history
Calcite commonly crystallizes from mineral-rich groundwater, hydrothermal fluids, or sedimentary environments; specimens may range from geologically recent to hundreds of millions of years old.
Uses & applications
Used in cement, lime, and agricultural materials; attractive crystal clusters are collected and sometimes displayed as décor.
Geological facts
Calcite effervesces in dilute acid and shows strong double refraction in clear crystals.
Field identification & locations
Look for relatively soft crystals, rhombohedral cleavage, and vigorous fizz with dilute acid; calcite occurs worldwide in limestone caves, veins, and hydrothermal deposits.
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