mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH,F)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 with conchoidal fracture.
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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 with conchoidal fracture.
Formation & geological history
Forms in pegmatites and hydrothermal veins associated with granitic magmas, often during late-stage crystallization under high temperatures and pressures.
Uses & applications
Widely used in metaphysical practices, mineral specimen collecting, jewelry, and piezoelectric or pyroelectric industrial applications.
Geological facts
Schorl makes up about 95 percent of all tourmaline found in nature and is historically known as a protective stone.
Field identification & locations
Easily identified by its deep black color, striated prismatic crystal faces, and high hardness; common globally including in India's pegmatite-rich regions.
