mineral
Polished orange calcite sphere
Calcite (CaCO₃), likely honey/orange calcite
AI-generated identification · may be incorrectMohs hardness 3; orange to honey-brown color with cloudy white banding, vitreous to pearly luster, trigonal crystal structure, and perfect rhombohedral cleavage. The polished surface obscures cleavage but may show layered or fibrous internal zoning.
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Physical properties
Mohs hardness 3; orange to honey-brown color with cloudy white banding, vitreous to pearly luster, trigonal crystal structure, and perfect rhombohedral cleavage. The polished surface obscures cleavage but may show layered or fibrous internal zoning.
Formation & geological history
Forms mainly in sedimentary limestones, hydrothermal veins, and cave deposits when calcium-rich fluids precipitate carbonate; most specimens are geologically young to Paleozoic or Mesozoic in host rock. Exact locality cannot be determined from the image.
Uses & applications
Used for ornamental spheres, carvings, and decorative objects; calcite is also important in cement, lime, aggregate, soil treatment, and chemical industries. It is generally a low-value ornamental mineral rather than a jewelry stone.
Geological facts
Calcite strongly effervesces with dilute hydrochloric acid and commonly shows strong birefringence, producing doubled images through clear pieces. Orange coloration may result from iron or other trace impurities.
Field identification & locations
Identify by its soft surface, easily scratched by a steel knife, rhombohedral cleavage, and acid reaction; avoid prolonged water or acidic cleaners. Orange calcite occurs widely in Mexico, Brazil, Romania, and the United States.
