mineral
Black Tourmaline
Schorl (NaFe3Al6(Si6O18)(BO33)(OH)4)
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, trigonal crystal system, and distinct prismatic striated crystals with conchoidal fracture.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, trigonal crystal system, and distinct prismatic striated crystals with conchoidal fracture.
Formation & geological history
Forms primarily in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization from boron-rich fluids.
Uses & applications
Used widely in metaphysical collections, jewelry, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Schorl accounts for about 95% of all tourmaline found in nature and was historically referred to simply as schorl before 1500.
Field identification & locations
Easily identified by its deep black color, prominent striations along the prism length, and lack of good cleavage. Commonly found worldwide, including pegmatites in the United States.
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Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic