mineral
Likely calcite cleavage fragment
Calcite (CaCO₃)
AI-generated identification · may be incorrectSmall white-to-translucent fragment with a pearly/glassy luster and flat-looking cleavage surfaces, consistent with calcite. 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 white-to-translucent fragment with a pearly/glassy luster and flat-looking cleavage surfaces, consistent with calcite. 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 environments, caves, hydrothermal veins, and as a component of limestone and marble; it occurs from geologically recent deposits to ancient rocks.
Uses & applications
Calcite is used in cement and lime production, construction stone, and as a mineral specimen; clear optical calcite has specialized uses.
Geological facts
Calcite effervesces in dilute acid and can show double refraction, though these tests are not visible in the photograph.
Field identification & locations
Look for softness, rhombohedral cleavage, and fizzing with dilute acid. Calcite is widespread worldwide, especially in limestone regions and caves.
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