gemstone

Green Tourmaline (Verdelite)

Complex sodium iron aluminum borosilicate (Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH)4)

Hardness: 7-7.5 on Mohs scale. Color: Rich deep forest green with strong pleochroism. Luster: Vitreous. Crystal system: Trigonal. Cleavage: Indistinct. Specific gravity: 3.06. Cut: Emerald-cut faceted gemstone.

Hardness: 7-7
Color: Rich deep forest green with strong pleochroism
Luster: Vitreous

Identified July 27, 2026More gemstone →

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Physical properties

Formation & geological history

Formed primarily in pegmatites and metamorphic rocks through hydrothermal activity rich in boron. Common locations include Brazil, Afghanistan, Nigeria, Mozambique, and the United States (Maine, California).

Uses & applications

Highly prized gemstone used in fine jewelry such as rings, pendants, and earrings. Also valued by gem and mineral collectors.

Geological facts

Green tourmaline is strongly pleochroic, meaning it displays different shades of green or even olive/brown depending on the angle from which it is viewed. It is often cut to showcase its finest green hue along its optic axis.

Field identification & locations

Identified by its vivid green color, hardness, strong pleochroism, and vitreous luster. Faceted gems are evaluated based on clarity, color saturation, cut quality, and carat weight.

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