mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, and trigonal crystal system with prominent striations.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, and trigonal crystal system with prominent striations.
Formation & geological history
Formed in pegmatites and hydrothermal veins through the crystallization of magma interacting with boron-rich fluids.
Uses & applications
Widely used in metaphysical collections, jewelry, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Black tourmaline is well known for its natural ability to hold an electrical charge and was historically used in early radio equipment.
Field identification & locations
Easily identified by its distinct triangular cross-section, vertical striations, and lack of cleavage; commonly found worldwide including Brazil and the USA.
