mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectMohs hardness of 7 to 7.5, black color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage.
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Physical properties
Mohs hardness of 7 to 7.5, black color, vitreous luster, trigonal crystal system, conchoidal fracture with no true cleavage.
Formation & geological history
Forms in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization.
Uses & applications
Widely used in jewelry, metaphysical healing practices, and electrical applications due to its pyroelectric and piezoelectric properties.
Geological facts
Schorl makes up about 95% of all tourmaline found in nature and was historically referred to as schorl since at least the 1500s.
Field identification & locations
Identified by its distinctive striated prismatic crystal habit and lack of cleavage; found globally with notable deposits in Brazil, Africa, and the USA.
