mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
AI-generated identification · may be incorrectHardness of 7 to 7.5 on the Mohs scale, opaque black color, vitreous to submetallic luster, and trigonal crystal system with distinct prismatic striations.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, opaque black color, vitreous to submetallic luster, and trigonal crystal system with distinct prismatic striations.
Formation & geological history
Forms in pegmatites and hydrothermal veins associated with cooling magma and metamorphic environments.
Uses & applications
Widely used in metaphysical collections, jewelry, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Black tourmaline is known for its ability to naturally hold an electrical charge and is the most abundant variety of tourmaline.
Field identification & locations
Easily identified by its deep black color, triangular cross-section, and striated crystal faces; found globally, notably in Brazil, Pakistan, 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