mineral
Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate)
AI-generated identification · may be incorrectHardness 7 to 7.5 on Mohs scale, black color, vitreous to submetallic luster, trigonal crystal system with striated prismatic columns, conchoidal fracture.
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Physical properties
Hardness 7 to 7.5 on Mohs scale, black color, vitreous to submetallic luster, trigonal crystal system with striated prismatic columns, conchoidal fracture.
Formation & geological history
Forms in pegmatites and hydrothermal veins through high-temperature crystallization from cooling magma and mineral-rich fluids.
Uses & applications
Used in piezoelectric devices, pressure gauges, jewelry, and prized by mineral collectors worldwide.
Geological facts
Schorl is the most common variety of tourmaline, accounting for approximately 95 percent of all tourmaline in nature.
Field identification & locations
Identified by its characteristic triangular cross-section, striated prism faces, and lack of cleavage; found globally in granitic pegmatites.
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