mineral
Blue Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 on Mohs scale. Color: Pale blue to grey-blue. Luster: Vitreous to pearly. Crystal structure: Trigonal. Cleavage: Perfect rhombohedral. Specific gravity: 2.71.
- Hardness
- 3 on Mohs scale
- Color
- Pale blue to grey-blue
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale. Color: Pale blue to grey-blue. Luster: Vitreous to pearly. Crystal structure: Trigonal. Cleavage: Perfect rhombohedral. Specific gravity: 2.71.
Formation & geological history
Forms in sedimentary environments as a precipitate, or in metamorphic rocks like marble. Often associated with limestone and other calcium-rich rocks.
Uses & applications
Used in the construction industry (cement, concrete), agricultural soil treatment, and occasionally carved or polished for ornamental purposes and crystal healing.
Geological facts
Calcite is highly reactive to weak acids, effervescing (fizzing) when exposed to dilute hydrochloric acid. It is one of the most common minerals on Earth.
Field identification & locations
Identified by its distinctive pale blue color, perfect rhombohedral cleavage, and low hardness (can be scratched by a copper coin). Found globally, with notable deposits in Mexico, Madagascar, and the USA.
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Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
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Epidote
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