mineral
Likely yellow calcite
Calcite (CaCO₃)
AI-generated identification · may be incorrectSmall, cut yellow-orange piece with a translucent-to-opaque appearance and vitreous to pearly luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; the image alone cannot confirm the identification.
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Physical properties
Small, cut yellow-orange piece with a translucent-to-opaque appearance and vitreous to pearly luster. Calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage; the image alone cannot confirm the identification.
Formation & geological history
Calcite forms in sedimentary and hydrothermal environments, including limestone and vein deposits, over a wide range of geological ages.
Uses & applications
Used in cement, lime, and other industrial products; attractive colored pieces are collected or occasionally fashioned into ornaments.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a copper coin, useful identification tests on an inconspicuous spot.
Field identification & locations
Check for softness, rhombohedral cleavage, and acid reaction; yellow calcite occurs worldwide. The specimen appears shaped or cut, so its source and identity are uncertain from the photo.
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