mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale. Color: Orange to yellow-orange. Luster: Vitreous to resinous. Crystal structure: Trigonal, often massive or rhombohedral. Cleavage: Perfect in three directions. Specific gravity: 2.71.
- Hardness
- 3 on Mohs scale
- Color
- Orange to yellow-orange
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 3 on Mohs scale. Color: Orange to yellow-orange. Luster: Vitreous to resinous. Crystal structure: Trigonal, often massive or rhombohedral. Cleavage: Perfect in three directions. Specific gravity: 2.71.
Formation & geological history
Forms in sedimentary environments, often as a precipitate from calcium-rich water in caves or hot springs, or as a secondary mineral in igneous and metamorphic rocks.
Uses & applications
Used in the manufacture of cement and lime, agricultural soil treatments, and as a popular collector's mineral or for metaphysical uses.
Geological facts
Calcite is known for its strong double refraction (birefringence), especially clear varieties like Iceland Spar. It readily effervesces (fizzes) when a weak acid like hydrochloric acid is applied.
Field identification & locations
Identify by its hardness (can be scratched by a copper penny), perfect rhombohedral cleavage, and reaction to weak acid. Commonly found worldwide, with notable orange varieties coming from Mexico.
