mineral
Blue Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale; Color: Sky blue to deep blue; Luster: Vitreous to waxy/greasy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Sky blue to deep blue
- Luster
- Vitreous to waxy/greasy
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Physical properties
Hardness: 3 on Mohs scale; Color: Sky blue to deep blue; Luster: Vitreous to waxy/greasy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71
Formation & geological history
Forms in sedimentary environments through chemical precipitation or in metamorphic environments as marble. This blue variety often forms in hydrothermal environments or via recrystallization of limestone.
Uses & applications
Primarily used as a decorative stone, in lapidary work for cabochons and carvings, and as a popular specimen for mineral collectors and metaphysical practitioners.
Geological facts
Blue Calcite is a very soft stone, making it easy to carve but fragile for jewelry use. The blue color is often attributed to tiny inclusions or structural defects within the crystal lattice.
Field identification & locations
Identifiable by its rhombohedral cleavage, softness (can be scratched by a copper penny), and effervescence when exposed to weak acid (HCl). Commonly found in Mexico, Africa, and Brazil.
