mineral

Green Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale light green to seafoam green; Luster: Vitreous to waxy/soapy; Crystal Structure: Trigonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Pale light green to seafoam green
Luster: Vitreous to waxy/soapy

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or via hydrothermal activity in veins. It is found in limestone and marble deposits varying in age from Proterozoic to Cenozoic.

Uses & applications

Predominantly used as a decorative stone, in metaphysical healing practices, as lapidary material for carvings, and occasionally in the manufacture of cement or lime when found in bulk.

Geological facts

Green calcite is often acid-washed or 'dipped' in weak acid by dealers to give it a smooth, waxy feel and to enhance its color. It is a carbonate mineral and will effervesce (fizz) if a drop of cold dilute hydrochloric acid is applied to it.

Field identification & locations

In the field, it is identified by its rhombohedral cleavage (breaks into slanted blocks) and its softness—it can be easily scratched by a copper penny or a knife. Found commonly in Mexico, Brazil, and the USA (notably Arizona).