mineral

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

AI-generated identification · may be incorrect

Hardness: 7-7.5 (Mohs scale); Color: Jet black, opaque; Luster: Vitreous to sub-metallic; Crystal Structure: Trigonal/Hexagonal with vertical striations; Cleavage: Indistinct; Specific Gravity: 3.0-3.25

Hardness: 7-7
Color: Jet black, opaque
Luster: Vitreous to sub-metallic

Identified January 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in pegmatites through hydrothermal and magmatic processes; can also occur in metamorphic rocks مثل schists. It is rich in boron and iron, allowing it to crystallize in late-stage igneous environments.

Uses & applications

Used in the gemstone industry for beads and carvings, as a source of boron, and in scientific instruments for its pyroelectric and piezoelectric properties. Highly valued as a protective stone in the metaphysical community.

Geological facts

One of the most common varieties of tourmaline, Schorl makes up about 95% of all tourmaline found in nature. It is naturally pyroelectric, meaning it can generate an electrical charge when heated.

Field identification & locations

Identify by its characteristic vertical striations along the prism faces, rounded triangular cross-section, and deep black opacity. Commonly found in Brazil, Namibia, Pakistan, and the United States (Maine and California).

Other mineral specimens

See all

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Metamorphic

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Pegmatite with Tourmaline and Quartz

Igneous Pegmatite

igneous

Granite

Granite (Phaneritic intrusive igneous rock)

igneous

Septarian Pebble

Septarian nodule / Concretion

sedimentary