gemstone
Green Tourmaline (Verdelite)
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
Hardness: 7-7.5 on Mohs scale. Color: Rich deep emerald-green to forest green. Luster: Vitreous. Crystal System: Trigonal. Cleavage: Indistinct. Specific Gravity: 3.0-3.2.
- Hardness
- 7-7
- Color
- Rich deep emerald-green to forest green
- Luster
- Vitreous
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Physical properties
Hardness: 7-7.5 on Mohs scale. Color: Rich deep emerald-green to forest green. Luster: Vitreous. Crystal System: Trigonal. Cleavage: Indistinct. Specific Gravity: 3.0-3.2.
Formation & geological history
Formed in granitic pegmatites and metamorphic rocks rich in boron through hydrothermal and magmatic processes.
Uses & applications
Highly valued as a precious gemstone in fine jewelry, including rings, pendants, and earrings, as well as a popular specimen for mineral collectors.
Geological facts
Green tourmaline, or verdelite, exhibits strong pleochroism, displaying different shades of green or olive when viewed from different crystal angles. Brazil, Mozambique, and Namibia produce some of the finest cut specimens.
Field identification & locations
Identified by its rich green hue, high transparency, hardness, and strong pleochroism. Commonly found in pegmatite fields worldwide, including Minas Gerais (Brazil) and Maine (USA).
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