mineral
Likely botryoidal calcite or aragonite specimen
Calcite (CaCO₃), possibly aragonite (CaCO₃)
AI-generated identification · may be incorrectSmall cream-white clustered, botryoidal grains with pearly to vitreous luster; calcite hardness 3, rhombohedral cleavage, specific gravity 2.71. The blurred image prevents reliable separation from aragonite or a pale carbonate-coated fragment.
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Physical properties
Small cream-white clustered, botryoidal grains with pearly to vitreous luster; calcite hardness 3, rhombohedral cleavage, specific gravity 2.71. The blurred image prevents reliable separation from aragonite or a pale carbonate-coated fragment.
Formation & geological history
Carbonate minerals commonly precipitate from groundwater, hydrothermal fluids, caves, and sedimentary cavities; formation ages range from modern to ancient. This appears to be a natural crystalline aggregate, though its exact locality is unknown.
Uses & applications
Calcite is used in cement, lime, construction aggregate, glass, agriculture, and acid-neutralizing products; attractive crystals are collected. This small specimen has mainly educational or decorative value.
Geological facts
Calcite effervesces strongly with dilute hydrochloric acid and commonly shows rhombohedral cleavage; aragonite typically forms needle-like or radiating crystals and is metastable relative to calcite.
Field identification & locations
Test with a steel nail (calcite scratches easily) and dilute acid on an inconspicuous spot; inspect under magnification for cleavage or radiating needles. Common sources include Mexico, the United States, Morocco, and Europe.
