mineral
Tourmaline
Complex boron silicate, (Na,Ca)(Al,Fe,Li)_3Al_6(BO_3)_3Si_6O_18(OH)_4
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, typically dark brown to black (schorl), vitreous luster, trigonal crystal system with distinct striated prismatic columns.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, typically dark brown to black (schorl), vitreous luster, trigonal crystal system with distinct striated prismatic columns.
Formation & geological history
Forms in igneous and metamorphic rocks, especially in pegmatites and hydrothermal veins, often through crystallization of magma enriched in volatiles.
Uses & applications
Used in jewelry, scientific equipment for pressure gauges, and occasionally as mineral specimens for collectors.
Geological facts
Tourmaline exhibits pyroelectricity and piezoelectricity, meaning it generates an electrical charge when heated or subjected to mechanical pressure.
Field identification & locations
Easily identified by its characteristic triangular cross-section and prominent vertical striations along the prism faces. Found globally in pegmatite-rich regions.
