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; specific gravity of 3.2.
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Physical properties
Mohs hardness of 7 to 7.5; deep black color; vitreous luster; trigonal crystal system; specific gravity of 3.2.
Formation & geological history
Forms in pegmatites and hydrothermal veins through high-temperature crystallization of boron-rich fluids.
Uses & applications
Widely used in metaphysical collections, jewelry, and industrial applications requiring piezoelectric properties.
Geological facts
Schorl is the most common variety of tourmaline, accounting for about 95% of all tourmaline in nature.
Field identification & locations
Easily identified by its prismatic crystals with striated vertical faces and conchoidal fracture.
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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