mineral

Green Tourmaline

Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH))

AI-generated identification · may be incorrect

Mohs hardness of 7 to 7.5, green color ranging from pale to dark, vitreous luster, trigonal crystal system with striated prismatic columns, and specific gravity around 3.0 to 3.2.

Identified October 17, 2026More mineral →

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Physical properties

Mohs hardness of 7 to 7.5, green color ranging from pale to dark, vitreous luster, trigonal crystal system with striated prismatic columns, and specific gravity around 3.0 to 3.2.

Formation & geological history

Forms primarily in pegmatites through hydrothermal activity and crystallization of volatile-rich magma, often associated with granitic rocks.

Uses & applications

Used widely in high-end jewelry as a gemstone and valued by collectors for its distinct prismatic crystal habits and rich color variations.

Geological facts

Tourmalines exhibit pyroelectric and piezoelectric properties, meaning they generate an electrical charge when heated or subjected to mechanical pressure.

Field identification & locations

Identified by its characteristic triangular cross-section, striated vertical prism faces, and lack of good cleavage. Commonly found in Brazil, Afghanistan, Madagascar, and the USA.