mineral

Green Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale to sea-foam green; Luster: Vitreous to waxy/greasy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Pale to sea-foam green
Luster: Vitreous to waxy/greasy

Identified March 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes or hydrothermal activity. It often precipitates in marine environments or through the cooling of calcium-rich hydrothermal fluids. It acts as a primary component in limestone and marble.

Uses & applications

Largely used as a decorative stone, for metaphysical/lapidary purposes, and as a source of lime in cement and fertilizer production for industrial-grade varieties.

Geological facts

Green calcite is known for its 'soapy' or waxy feel when rumbled. It is highly reactive to cold dilute hydrochloric acid, which will cause it to effervesce (fizz) immediately—a primary test for carbonate minerals.

Field identification & locations

Identify in the field by its rhombohedral cleavage, softness (can be scratched by a copper penny), and acid reaction. Common locations include Mexico, Brazil, and the USA.