mineral
Green Tourmaline
Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
Hardness: 7-7.5 (Mohs), Color: Green (various shades), Luster: Vitreous, Crystal structure: Trigonal, Cleavage: Indistinct, Specific gravity: 2.82-3.32
- Hardness
- 7-7
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Physical properties
Hardness: 7-7.5 (Mohs), Color: Green (various shades), Luster: Vitreous, Crystal structure: Trigonal, Cleavage: Indistinct, Specific gravity: 2.82-3.32
Formation & geological history
Forms in pegmatites and metamorphic rocks under high temperature and pressure conditions.
Uses & applications
Commonly faceted into gemstones for use in jewelry.
Geological facts
Green tourmaline, often referred to as verdelite, is highly pleochroic, meaning its color can appear different depending on the angle of view.
Field identification & locations
Identified by its distinctive green color, strong pleochroism, and trigonal crystal habit (often forming prismatic crystals with rounded triangular cross-sections). Found in Brazil, Afghanistan, Pakistan, and parts of Africa.
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