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, deep black color, vitreous to submetallic luster, and trigonal crystal system with prominent striations.
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Physical properties
Hardness of 7 to 7.5 on the Mohs scale, deep black color, vitreous to submetallic luster, and trigonal crystal system with prominent striations.
Formation & geological history
Forms primarily in pegmatites, hydrothermal veins, and metamorphic rocks through high-temperature crystallization of boron-rich fluids.
Uses & applications
Widely used in metaphysical collections, jewelry, and industrial applications due to its pyroelectric and piezoelectric properties.
Geological facts
Schorl accounts for roughly 95 percent of all tourmaline found in nature and was historically referred to simply as schorl until the late Middle Ages.
Field identification & locations
Easily identified by its characteristic triangular cross-section, vertical striations, and conchoidal fracture. Common worldwide, though entirely plausible in pegmatitic or metamorphic contexts.
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Sandstone (with potential mineral staining/concretions)
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sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic