mineral

Green Tourmaline

Elbaite - Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4

Hardness: 7-7.5 on Mohs scale; Color: Green (from pale to deep emerald-green); Luster: Vitreous; Crystal Structure: Trigonal (often long, striated columns); Cleavage: Indistinct; Specific Gravity: 3.06.

Hardness: 7-7
Color: Green (from pale to deep emerald-green)
Luster: Vitreous

Identified March 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in granitic pegmatites or metamorphic rocks through hydrothermal processes. The presence of lithium and boron is key to its formation during the final stages of magma crystallization.

Uses & applications

Used extensively as a semi-precious gemstone in jewelry. It also has industrial applications in high-pressure gauges due to its piezoelectric properties.

Geological facts

Also known as 'Verdelite,' green tourmaline exhibits strong pleochroism, meaning it appears different shades of green when viewed from different angles. It is known as the 'stone of physical heart healing.'

Field identification & locations

Identify in the field by its distinct parallel striations (vertical lines) along the length of the crystal and its prismatic shape. Commonly found in Brazil, Afghanistan, and Namibia. Collectors should look for clarity and deep color saturation.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral