mineral
Likely calcite fragment
Calcite (calcium carbonate, CaCO₃)
AI-generated identification · may be incorrectCream to pale yellow, translucent to opaque, with a dull-to-glassy luster and likely rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The blurry image limits confirmation; it may also be a pale limestone or aragonite fragment.
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Physical properties
Cream to pale yellow, translucent to opaque, with a dull-to-glassy luster and likely rhombohedral cleavage; Mohs hardness 3, specific gravity about 2.71. The blurry image limits confirmation; it may also be a pale limestone or aragonite fragment.
Formation & geological history
Calcite commonly precipitates from groundwater or seawater, forms in sedimentary limestone and marble, and occurs in hydrothermal veins. Its age could range from modern deposits to ancient Paleozoic or older rocks.
Uses & applications
Used in cement, lime, aggregate, soil treatment, and chemical manufacturing; transparent crystals are collectible, though this fragment appears low-grade.
Geological facts
Calcite effervesces vigorously with dilute hydrochloric acid or household vinegar, especially when powdered or freshly scratched. It commonly shows rhombohedral cleavage and may display double refraction.
Field identification & locations
Common worldwide, especially in limestone regions, caves, hydrothermal veins, and marble. Test with a steel nail (usually scratches it) and dilute acid; avoid acid on valuable specimens.
