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, trigonal crystal system, and indistinct cleavage.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, trigonal crystal system, and indistinct cleavage.
Formation & geological history
Forms in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization from boron-rich fluids.
Uses & applications
Widely used in metaphysical healing, jewelry, electrical components due to piezoelectric properties, and mineral collections.
Geological facts
Schorl accounts for about 95% of all tourmaline found in nature and was historically referred to as schorl since at least 1500.
Field identification & locations
Identified by its characteristic prismatic crystal habit with vertical striations and lack of good cleavage; found worldwide with notable deposits in Brazil, Africa, and the USA.
