mineral
Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: Banded orange and white; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral
- Hardness
- 3 on Mohs scale (can be scratched by a copper coin)
- Color
- Banded orange and white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: Banded orange and white; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral
Formation & geological history
Formed through sedimentary processes or hydrothermal activity where calcium-rich solutions precipitate in rock cavities or veins. The orange color is typically caused by iron oxide inclusions.
Uses & applications
Used primarily as decorative stones, in lapidary work (tumbled stones, carvings), and as a collector specimen. Also used in the manufacture of cement and lime in industrial scales.
Geological facts
Calcite is one of the most common minerals on Earth. It is famous for its optical property called double refraction, where a crystal placed over text will make the words appear twice.
Field identification & locations
Identify in the field by its softness and its reactive nature—it will effervesce (fizz) when in contact with a weak acid like vinegar. Commonly found in limestone quarries and hydrothermal veins.
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