mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectHardness: 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
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Physical properties
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.
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.
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Other mineral specimens
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