mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH,F)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 vertical 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 vertical striations.
Formation & geological history
Forms in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization from boron-rich fluids.
Uses & applications
Used in metaphysical collections, jewelry, and sometimes in industrial applications for its piezoelectric and pyroelectric properties.
Geological facts
Schorl is the most common variety of tourmaline, accounting for about 95% of all tourmaline in nature.
Field identification & locations
Easily identified by its prismatic crystal habit, triangular cross-section, and strong vertical striations. Found globally, notably in Brazil, Pakistan, and the USA.
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