mineral
Blue Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale; Color: Light blue to pale blue-grey; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Light blue to pale blue-grey
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 3 on Mohs scale; Color: Light blue to pale blue-grey; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71
Formation & geological history
Formed through sedimentary processes or as a secondary mineral in igneous and metamorphic rocks. Often precipitating from calcium-rich hydrothermal fluids in limestone caves or hydrothermal veins.
Uses & applications
Used as an ornamental stone, in metaphysical practices (healing crystals), as a source of lime, and for chemical applications in agriculture and industry.
Geological facts
Calcite is famous for its double refraction property. Blue calcite specifically is often acid-washed to give it a characteristic smooth, waxy feel that differs from the rougher texture of other calcite colors.
Field identification & locations
Identify in the field by its 3-way rhombohedral cleavage and its rapid effervescence (bubbling) when exposed to cold dilute hydrochloric acid. It is much softer than quartz or fluorite.
