mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectHardness of 7-7.5 on the Mohs scale, black color, vitreous to submetallic luster, trigonal crystal system with prismatic striations, and conchoidal fracture.
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Physical properties
Hardness of 7-7.5 on the Mohs scale, black color, vitreous to submetallic luster, trigonal crystal system with prismatic striations, and conchoidal fracture.
Formation & geological history
Forms primarily in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization from boron-rich fluids.
Uses & applications
Used in jewelry, metaphysical collections, and industrial applications for its pyroelectric and piezoelectric properties.
Geological facts
Schorl is the most common variety of tourmaline, accounting for about 95% of all tourmaline in nature.
Field identification & locations
Identified by its distinctive triangular cross-section, vertical striations, and lack of cleavage; commonly found worldwide, notably in Brazil, Pakistan, and the USA.
