mineral
Green Tourmaline
Elbaite, Na(Al,Li)3Al6(Si6O18)(BO3)3(OH)4
AI-generated identification · may be incorrectHardness of 7-7.5 on the Mohs scale, green color with varying shades, vitreous luster, trigonal crystal system, conchoidal fracture with indistinct cleavage, specific gravity of 3.0-3.25.
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Physical properties
Hardness of 7-7.5 on the Mohs scale, green color with varying shades, vitreous luster, trigonal crystal system, conchoidal fracture with indistinct cleavage, specific gravity of 3.0-3.25.
Formation & geological history
Forms in pegmatites and hydrothermal veins associated with granitic magmas during late-stage cooling.
Uses & applications
Used primarily in fine jewelry, metaphysical collections, and piezoelectric applications.
Geological facts
Green tourmaline is also known as verdelite and owes its rich green color to trace amounts of iron and sometimes chromium.
Field identification & locations
Identified by its distinctive rounded triangular cross-section, striated crystal faces, and strong pleochroism. Commonly sourced from Brazil, Afghanistan, and the USA.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
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Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
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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