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, black color, vitreous to submetallic luster, and trigonal crystal system with striated prismatic columns.
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Physical properties
Hardness of 7-7.5 on the Mohs scale, black color, vitreous to submetallic luster, and trigonal crystal system with striated prismatic columns.
Formation & geological history
Forms in igneous and metamorphic rocks, as well as hydrothermal veins, through the crystallization of boron-rich fluids.
Uses & applications
Widely used in metaphysical practices, mineral collecting, and occasionally in industrial applications due to its pyroelectric 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 characteristic triangular cross-section, vertical striations, and lack of cleavage; found globally, notably in Brazil, Pakistan, and the USA.
