mineral

Green Calcite

Calcium Carbonate (CaCO3)

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

Identified April 16, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale. Color: Pale to lime green. Luster: Vitreous to waxy. Crystal structure: Trigonal/Rhombohedral. Cleavage: Perfect rhombohedral in three directions. Specific Gravity: 2.71.

Formation & geological history

Formed through sedimentary processes or as a secondary mineral in igneous and metamorphic environments. It often precipitates from marine organisms or in hydrothermal veins and hot springs.

Uses & applications

Primarily used as a decorative stone, in lapidary work for carvings, and as a popular specimen for metaphysical collectors. Industrial uses of calcite include lime production, fertilizer, and construction materials.

Geological facts

Calcite is one of the most common minerals on Earth's crust. Green calcite is unique for its often 'acid-washed' or waxy appearance, which is sometimes created by a brief acid bath to smooth the surface and enhance the color.

Field identification & locations

Identify it by its rhombohedral cleavage and its reaction (effervescence) to cold dilute hydrochloric acid. It is much softer than quartz and can be scratched with a copper penny. Commonly found in Mexico and Brazil.