gemstone
Green Tourmaline
Elbaite, Na(Al1.5Li1.5)Al6(Si6O18)(BO3)3(OH)4
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, vivid green color, vitreous luster, and trigonal crystal system with prismatic habit.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, vivid green color, vitreous luster, and trigonal crystal system with prismatic habit.
Formation & geological history
Forms primarily in pegmatites and hydrothermal veins through high-temperature crystallization from mineral-rich fluids.
Uses & applications
Extensively used in high-end fine jewelry, as a piezoelectric material in pressure sensors, and prized by mineral collectors.
Geological facts
Green tourmaline, known as verdelite, often displays strong pleochroism, showing deeper shades when viewed from different crystal axes.
Field identification & locations
Identified by its characteristic vertical striations, strong pleochroism, and distinct prismatic crystal cross-sections; found globally including Brazil and Afghanistan.
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