mineral

Green Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: Pale to sea-foam green; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71.

Hardness: 3 on Mohs scale (can be scratched by a copper coin)
Color: Pale to sea-foam green
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes or hydrothermal precipitation in veins. It often crystallizes from calcium-rich solutions in caves or marine environments. It can be found in deposits ranging from millions of years old to relatively recent formations.

Uses & applications

Primarily used as a decorative stone, in lapidary work for cabochons and carvings, and widely sold in the metaphysical and mineral collecting markets. Industrially, calcite is used in cement and agricultural lime, though green varieties are usually reserved for aesthetics.

Geological facts

Calcite is unique for its 'double refraction' property, where light splitting through a clear crystal creates a double image. Green calcite specifically gets its color from chlorite trapped during the crystallization process. It is often acid-washed by dealers to give it a smooth, waxy feel.

Field identification & locations

Identify in the field by its softness (scratchable with a knife) and its effervescence (bubbling) when exposed to cold dilute hydrochloric acid or vinegar. Common locations include Mexico, Brazil, and Canada. For collectors, look for deep color saturation and translucent edges.