mineral
Blue Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale; Color: light sky blue to pale blue; Luster: vitreous to waxy/pearly; Crystal System: Trigonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- light sky blue to pale blue
- Luster
- vitreous to waxy/pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: light sky blue to pale blue; Luster: vitreous to waxy/pearly; Crystal System: Trigonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71
Formation & geological history
Formed through sedimentary processes, primarily in marine environments where calcium carbonate precipitates out of water or accumulates from shell/coral fragments. It can also form through hydrothermal activity and within metamorphic marble.
Uses & applications
Used in home decor, lapidary carvings, metaphysical practices, and as a source for calcium in chemical industries. High-quality specimens are popular among mineral collectors.
Geological facts
Calcite is the most common carbonate mineral. Blue calcite is particularly associated with serene environments and is often sold as a 'soothing stone.' It reacts strongly (effervesces) with cold dilute hydrochloric acid.
Field identification & locations
Identify in the field by its rhombohedral cleavage, its softness (it can be scratched by a copper penny but not a fingernail), and the 'soapy' or waxy feel common in many specimens. Often found in Mexico and Madagascar.
