mineral
Yellow Calcite (Polished Pebble)
Calcium Carbonate (CaCO3)
Mohs hardness of 3, soft and easily scratched by a steel nail. Translucent yellow to honey-orange color with a vitreous to waxy luster. Features trigonal crystal system and rhombohedral cleavage.
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Physical properties
Mohs hardness of 3, soft and easily scratched by a steel nail. Translucent yellow to honey-orange color with a vitreous to waxy luster. Features trigonal crystal system and rhombohedral cleavage.
Formation & geological history
Forms through chemical precipitation in sedimentary basins, caves, and hydrothermal veins. Common in limestone-rich areas worldwide.
Uses & applications
Popular for lapidary work, tumbled stones, ornamental carvings, and crystal healing collections.
Geological facts
Calcite exhibits double refraction (birefringence) and reacts strongly with weak acids like vinegar, producing bubbles of carbon dioxide gas.
Field identification & locations
Identified by its softness (hardness 3), distinct soapy/waxy texture when polished, and fizzing reaction with dilute acid. Found commonly in Brazil, Mexico, and USA.
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