mineral
Green Tourmaline
Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
AI-generated identification · may be incorrectHardness: 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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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous