mineral
Tourmaline
Elbaite / Tourmaline group (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
AI-generated identification · may be incorrectHardness of 7-7.5 on Mohs scale. Displays green, blue, and multicolored prismatic crystal fragments with striated faces and vitreous luster.
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Physical properties
Hardness of 7-7.5 on Mohs scale. Displays green, blue, and multicolored prismatic crystal fragments with striated faces and vitreous luster.
Formation & geological history
Formed in pegmatites and hydrothermal veins during late-stage crystallization of magmas.
Uses & applications
Used in high-end gemstone jewelry, mineral collections, and industrial pressure sensors due to piezoelectric properties.
Geological facts
Tourmalines exhibit strong pleochroism, often changing colors depending on the viewing angle.
Field identification & locations
Easily identified by triangular cross-sections, distinct vertical striations, and prismatic crystal habit. Found globally in Brazil, Afghanistan, and the USA.
