mineral
Blue Calcite
Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale; Color: Pale sky blue to milky blue; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Pale sky blue to milky blue
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 3 on Mohs scale; Color: Pale sky blue to milky blue; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71
Formation & geological history
Formed through sedimentary processes, primarily from the shells of marine organisms or precipitation from calcium-rich hydrothermal fluids. It is commonly found in sedimentary environments like limestone beds.
Uses & applications
Predominantly used as a decorative stone, in lapidary work (cabbing and tumbling), and as a popular specimen for metaphysical and mineral collectors.
Geological facts
Blue Calcite is very soft and can easily be scratched by a knife or even a copper penny. It will effervesce (fizz) if exposed to weak acids like vinegar due to its carbonate composition.
Field identification & locations
Identify in the field by its pale blue color, waxy luster, and rhombohedral cleavage planes. Common locations include Mexico, Madagascar, and Brazil.
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