mineral

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

AI-generated identification · may be incorrect

Hardness: 7-7.5 on Mohs scale. Color: Black, opaque. Luster: Vitreous to submetallic. Crystal structure: Trigonal, commonly forming long prismatic crystals with striated vertical faces. Cleavage: Indistinct. Specific gravity: 3.0-3.2.

Hardness: 7-7
Color: Black, opaque
Luster: Vitreous to submetallic

Identified July 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed mainly in pegmatites and hydrothermal veins, as well as in metamorphic rocks like schists and gneisses, through the crystallization of boron-rich silicate melts and fluids.

Uses & applications

Widely used in metaphysical practices, crystal healing, decorative items, and occasionally as collector specimens or for piezoelectric applications.

Geological facts

Black tourmaline, also known as Schorl, makes up about 95% of all tourmaline found in nature. It is famous for its unique striated crystal faces and pyroelectric properties.

Field identification & locations

Easily identified by its deep black color, columnar crystal habit with distinct striations, and lack of good cleavage. Common locations include Brazil, USA, Pakistan, and Madagascar.