mineral

Black Tourmaline

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

Hardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, and trigonal crystal system with prismatic habit.

Identified October 28, 2026More mineral →

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Physical properties

Hardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, and trigonal crystal system with prismatic habit.

Formed in pegmatites and hydrothermal veins through high-temperature interactions of boron-rich fluids with crustal rocks.

Widely used in metaphysical jewelry, beaded bracelets, and as mineral specimens for collectors.

Black tourmaline is well known for its strong pyroelectric and piezoelectric properties, generating an electric charge when heated or stressed.

Identified by its striated prismatic crystals, lack of cleavage, and conchoidal fracture. Commonly found in Brazil, Pakistan, and the USA.

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)