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
Formed through pegmatitic and hydrothermal processes in igneous and metamorphic environments.
Uses & applications
Widely used in metaphysical practices, jewelry, and as a mineral specimen for collectors.
Geological facts
Schorl accounts for approximately 95% of all tourmaline found in nature and exhibits pyroelectric properties.
Field identification & locations
Easily identified by its characteristic triangular cross-section and deep vertical striations; commonly found worldwide.
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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