mineral

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH,F,O)4)

AI-generated identification · may be incorrect

Hardness of 7-7.5 on the Mohs scale, black color, vitreous to submetallic luster, trigonal crystal system with distinct striated prismatic crystals, conchoidal fracture, and specific gravity of 3.0-3.2.

Identified July 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily in pegmatites, hydrothermal veins, and metamorphic rocks like schists and gneisses through the crystallization of magma rich in boron and water.

Uses & applications

Widely used in metaphysical practices, holistic healing, gemstone jewelry, and occasionally in industrial applications due to its pyroelectric and piezoelectric properties.

Geological facts

Black tourmaline is known scientifically as schorl, which historically was also a village in Germany where the mineral was found as early as 1400.

Field identification & locations

Easily identified in the field by its characteristic triangular cross-section, striated vertical prism faces, and lack of cleavage. Commonly found worldwide, notably in Brazil, Pakistan, and the USA.