mineral
Orange calcite (likely)
Calcite, calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectHardness 3 Mohs; orange to honey-brown, pearly to vitreous luster, commonly translucent, with rhombohedral cleavage and trigonal crystal structure. The rough, pale-orange appearance is consistent with calcite, though the photo alone cannot confirm it.
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Physical properties
Hardness 3 Mohs; orange to honey-brown, pearly to vitreous luster, commonly translucent, with rhombohedral cleavage and trigonal crystal structure. The rough, pale-orange appearance is consistent with calcite, though the photo alone cannot confirm it.
Formation & geological history
Forms in sedimentary limestones, hydrothermal veins, and cave deposits through precipitation from calcium-rich fluids; specimens may range from recent deposits to ancient Paleozoic or Mesozoic host rocks.
Uses & applications
Used industrially in cement, lime, aggregate, soil treatment, and chemical production; attractive orange pieces are sold as inexpensive display specimens.
Geological facts
Calcite effervesces strongly with dilute hydrochloric acid or vinegar, especially on a freshly scratched surface. It commonly shows rhombohedral cleavage and can display double refraction.
Field identification & locations
Likely calcite if it scratches easily with a steel knife and fizzes with acid; common worldwide, including Mexico, the United States, Brazil, and China. It may also be orange aragonite or altered carbonate rock.
