mineral
Black Tourmaline in Quartz Matrix
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
Hardness: 7-7.5 (Mohs scale). Color: Jet black (Schorl) in white to smoky quartz. Luster: Vitreous to sub-metallic. Crystal Structure: Trigonal/Hexagonal elongated prisms with vertical striations.
- Hardness
- 7-7
- Color
- Jet black (Schorl) in white to smoky quartz
- Luster
- Vitreous to sub-metallic
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Physical properties
Hardness: 7-7.5 (Mohs scale). Color: Jet black (Schorl) in white to smoky quartz. Luster: Vitreous to sub-metallic. Crystal Structure: Trigonal/Hexagonal elongated prisms with vertical striations.
Formation & geological history
Formed in igneous pegmatites through hydrothermal processes where boron-rich fluids crystallize. Often found in granulites and schists alongside quartz and feldspar.
Uses & applications
Used primarily as metaphysical healing stones, collector specimens, and occasionally crushed for industrial use in pressure sensors due to pyroelectric and piezoelectric properties.
Geological facts
Black tourmaline is the most common variety of tourmaline. It is uniquely pyroelectric, meaning it can generate an electrical charge when heated or cooled.
Field identification & locations
Identify by the distinctive triangular cross-section of the black crystals and vertical striations on the prism faces. Frequently found in Brazil, Namibia, and the USA (Maine/California).
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