mineral
Black Tourmaline
Schorl (NaFe3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, black color, vitreous luster, hexagonal crystal system, and indistinct cleavage.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, black color, vitreous luster, hexagonal crystal system, and indistinct cleavage.
Formation & geological history
Forms in igneous and metamorphic rocks, as well as hydrothermal veins, through crystallization from boron-rich fluids at high temperatures.
Uses & applications
Widely used in jewelry, metaphysical practices, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Black tourmaline is well known for its ability to naturally hold an electrical charge and is often used to shield against electromagnetic fields.
Field identification & locations
Identified by its characteristic prismatic crystal habit with vertical striations and lack of cleavage; commonly sourced from Brazil, Africa, and the USA.
