mineral
Calcite crystal cluster
Calcite, CaCO₃
AI-generated identification · may be incorrectPale cream to translucent crystals with a vitreous-to-pearly luster; calcite is trigonal, Mohs hardness 3, and has perfect rhombohedral cleavage. The image suggests a cluster of blocky crystals, but exact identification would require testing.
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Physical properties
Pale cream to translucent crystals with a vitreous-to-pearly luster; calcite is trigonal, Mohs hardness 3, and has perfect rhombohedral cleavage. The image suggests a cluster of blocky crystals, but exact identification would require testing.
Formation & geological history
Calcite commonly crystallizes from mineral-rich groundwater, hydrothermal fluids, or sedimentary environments; its age cannot be determined from the photo.
Uses & applications
Used in cement and lime production, agriculture, and as a decorative or collectible mineral specimen; clear calcite is sometimes cut for display, but is too soft for most jewelry.
Geological facts
Calcite effervesces in dilute acid and, unlike quartz, can be scratched with a copper coin. It often shows strong double refraction in transparent crystals.
Field identification & locations
Look for softness, rhombohedral cleavage, and acid reaction; common worldwide in limestone caves, veins, and sedimentary deposits. The cluster’s locality and precise identity cannot be established from appearance alone.
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