mineral

Green Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale green to lime green; 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 green to lime green
Luster: Vitreous to waxy

Identified June 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily through sedimentary processes by chemical precipitation or as a main component of marine organism shells. It can also form in hydrothermal veins or as a secondary mineral in igneous rocks via carbonatite cooling.

Uses & applications

Commonly used as a decorative stone, in lapidary work (cabochons), as an source of lime for cement, and widely collected by mineral enthusiasts for its translucent properties.

Geological facts

Calcite is famous for its double refraction property (birefringence). If you look through a clear crystal, you will see a double image. This green variety gets its tint from chlorite or other mineral inclusions trapped during crystallization.

Field identification & locations

Identified in the field by its softness (can be scratched by a copper coin) and its vigorous effervescence (bubbling) when in contact with dilute hydrochloric acid. It typically feels smoother or more 'waxy' than quartz. Found commonly in Mexico, Brazil, and the USA.