mineral
Calcite on Host Rock
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 (Mohs scale), Color: White to yellowish-white, Luster: Vitreous to pearly, Crystal structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral
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Physical properties
Hardness: 3 (Mohs scale), Color: White to yellowish-white, Luster: Vitreous to pearly, Crystal structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral
Formation & geological history
Formed via chemical precipitation in hydrothermal veins or sedimentary environments where calcium-rich fluids interact with CO2. Often found in limestone or marble host rocks.
Uses & applications
Used in the manufacture of cement, as an agricultural soil treatment, in the chemical industry, and as decorative mineral specimens.
Geological facts
Calcite is one of the most common minerals on Earth. It is famous for its double refraction and its high reactivity to weak acids like vinegar.
Field identification & locations
Identify in the field by its softness (can be scratched by a copper coin) and its effervescence (bubbles) when a drop of cold dilute hydrochloric acid or vinegar is applied. Found globally in sedimentary basins.
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