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, and trigonal crystal system with distinct 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 distinct striated prismatic columns.
Formation & geological history
Forms in pegmatites, hydrothermal veins, and metamorphic rocks under high-temperature conditions involving boron-rich fluids.
Uses & applications
Extensively used in high-end jewelry, metaphysical collections, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Black tourmaline is known as schorl, which historically made up over 90 percent of all tourmaline found in nature.
Field identification & locations
Easily identified by its deep black color, lack of cleavage, and vertical striations along the prism faces. Commonly sourced from Brazil, Pakistan, and the United States.
