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 luster, hexagonal 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 luster, hexagonal crystal system, and indistinct cleavage.
Formation & geological history
Forms primarily in pegmatites, hydrothermal veins, and metamorphic rocks under high-temperature conditions during various geological eras.
Uses & applications
Widely used in jewelry, as mineral specimens for collectors, and in industrial applications due to its piezoelectric and pyroelectric properties.
Geological facts
Schorl is the most common variety of tourmaline, accounting for about 95% of all tourmaline in nature. It was historically referred to as schorl before the name was standardized.
Field identification & locations
Easily identified by its deep black color, prismatic crystal habit with striations, and lack of good cleavage. Commonly found in Brazil, Pakistan, and the United States.
