mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectMohs hardness of 7 to 7.5; deep black color; vitreous luster; trigonal crystal system with prismatic habit and striated faces; conchoidal fracture with no true cleavage.
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Physical properties
Mohs hardness of 7 to 7.5; deep black color; vitreous luster; trigonal crystal system with prismatic habit and striated faces; conchoidal fracture with no true cleavage.
Formation & geological history
Forms in pegmatites, hydrothermal veins, and metamorphic rocks like schists and gneisses through high-temperature fluid activity.
Uses & applications
Widely used in metaphysical practices, crystal healing, and as tumbled stones or mineral specimens for collectors.
Geological facts
Schorl is the most common variety of tourmaline, accounting for about 95 percent of all tourmaline in nature.
Field identification & locations
Identified by its characteristic triangular cross-section in raw crystals and strong striations along the prism length; found globally with notable deposits in Brazil, Africa, and the USA.
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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
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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous