mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale to sky blue; Luster: Vitreous to waxy/pearly; Crystal System: Trigonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Pale to sky blue
Luster: Vitreous to waxy/pearly

Identified July 7, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale to sky blue; Luster: Vitreous to waxy/pearly; Crystal System: Trigonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Formed in sedimentary environments through chemical precipitation or in metamorphic environments as marble. The blue color is often attributed to tiny inclusions of other minerals or light scattering (Tyndall effect).

Uses & applications

Used in the manufacturing of cement and lime, as a flux in glass making, in the ornamental carving industry, and widely collected as a metaphysical stone.

Geological facts

Calcite is one of the most common minerals on Earth. Blue calcite is particularly popular in the holistic community for its purportedly calming energy and is often acid-washed to give it a smooth, waxy finish.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper coin) and its effervescent reaction to dilute hydrochloric acid. It is commonly found in large deposits in Mexico and Madagascar.