mineral
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale; Color: Colorless to white; Luster: Vitreous to pearly; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions.
- Hardness
- 3 on Mohs scale
- Color
- Colorless to white
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: Colorless to white; Luster: Vitreous to pearly; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions.
Formation & geological history
Forms through sedimentary precipitation in marine environments, hydrothermal veins, and as a primary mineral in igneous carbonatites. It is the main component of limestone and marble.
Uses & applications
Used in the manufacture of cement and mortar, as a soil conditioner in agriculture, in the optical industry (high-grade Iceland Spar), and as a collector specimen.
Geological facts
Calcite is famous for its double refraction (birefringence), where light passing through a clear crystal splits into two rays, making objects viewed through it appear doubled.
Field identification & locations
Identify in the field by its 3-way rhombohedral cleavage and its strong effervescent reaction (fizzing) when exposed to weak hydrochloric acid or vinegar.
