Green Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale green to seafoam green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71.

Formation & Geological History

Formed through sedimentary processes or hydrothermal activity. It often precipitates from marine organisms' remains or in volcanic cavities. Can be formed in a wide range of geological ages from Precambrian to recent.

Uses & Applications

Used primarily for ornamental carvings, jewelry (though soft), metaphysical collecting, and as a source of lime in chemical industries.

Geological Facts

Green calcite is often called a 'stone of emotional balance.' Unlike many green minerals that get their color from chromium or copper, green calcite's color is often attributed to trapped organic matter or slight chemical impurities during crystallization.

Field Identification & Locations

Identify in the field by its distinct waxy feel, 3-way rhombohedral cleavage, and its reaction (bubbling/effervescence) when touched with room-temperature diluted hydrochloric acid. Commonly found in Mexico, Brazil, and the USA.

Identified on: 4/29/2026

Mode: Standard