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. Luster: Vitreous to submetallic. Crystal structure: Trigonal, commonly forming long, striated prismatic crystals. Cleavage: Indistinct. Specific gravity: 3.2-3.26.
- Hardness
- 7-7
- Color
- Black
- Luster
- Vitreous to submetallic
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Physical properties
Hardness: 7-7.5 on Mohs scale. Color: Black. Luster: Vitreous to submetallic. Crystal structure: Trigonal, commonly forming long, striated prismatic crystals. Cleavage: Indistinct. Specific gravity: 3.2-3.26.
Formation & geological history
Forms in igneous and metamorphic rocks, as well as in hydrothermal veins and pegmatites. It crystallizes from cooling magma and fluids rich in boron.
Uses & applications
Used in jewelry, metaphysical and crystal healing practices, electrical applications due to its piezoelectric properties, and as mineral specimens for collectors.
Geological facts
Black tourmaline, also known as schorl, accounts for about 95% of all tourmaline found in nature. The name comes from the Sri Lankan word 'turamali', meaning 'mixed gemstones'.
Field identification & locations
Easily identified by its characteristic triangular cross-section and deep vertical striations on crystal faces. Found worldwide, with notable deposits in Brazil, Africa, the USA, and Pakistan.
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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