mineral
Blue Calcite
Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale; Color: Pale blue to sky blue; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral
- Hardness
- 3 on Mohs scale
- Color
- Pale blue to sky blue
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3 on Mohs scale; Color: Pale blue to sky blue; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral
Formation & geological history
Formed in sedimentary environments through chemical precipitation or in metamorphic settings as marble. The blue color often comes from tiny inclusions or structural defects in the crystal lattice during formation.
Uses & applications
Primarily used as a decorative stone, in lapidary work for cabochons and carvings, and as a popular specimen for metaphysical collectors.
Geological facts
Blue calcite is known for its relatively soft nature, making it popular for beginners to practice stone carving. It often has a slightly waxy feel when polished.
Field identification & locations
Look for its characteristic rhombohedral cleavage and softness (can be scratched by a copper penny). It will react and effervesce if exposed to weak hydrochloric acid. Common in Mexico and Madagascar.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock