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, deep black color, vitreous to submetallic luster, and trigonal crystal system with prominent prismatic striations.
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Physical properties
Hardness of 7-7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, and trigonal crystal system with prominent prismatic striations.
Formation & geological history
Forms primarily in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization from boron-rich fluids.
Uses & applications
Widely used in metaphysical practices, jewelry, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Schorl accounts for about 95% of all tourmaline found in nature and was historically referred to simply as schorl before the 18th century.
Field identification & locations
Identified by its prismatic crystal habit, strong striations along the length, conchoidal fracture, and lack of cleavage. Commonly found worldwide, notably in Brazil, Pakistan, and the USA.
