mineral
Tourmaline
Complex boron silicate (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
AI-generated identification · may be incorrectHardness of 7-7.5 on the Mohs scale, typically green or multicolored, vitreous luster, trigonal crystal system with striated prismatic columns.
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Physical properties
Hardness of 7-7.5 on the Mohs scale, typically green or multicolored, vitreous luster, trigonal crystal system with striated prismatic columns.
Formation & geological history
Forms in pegmatites and metamorphic rocks through hydrothermal activity and high-temperature mineral crystallization over millions of years.
Uses & applications
Used in high-end jewelry, piezoelectric pressure sensors, and prized by mineral collectors for its crystal habit.
Geological facts
Tourmaline exhibits strong pleochroism, meaning it can show different colors when viewed from different angles.
Field identification & locations
Identify by its distinct triangular cross-section, vertical striations on the prism faces, and lack of cleavage.
