mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
Hardness: 7-7.5 on the Mohs scale. Color: Black. Luster: Vitreous to submetallic. Crystal structure: Trigonal, commonly forming prismatic, striated columnar crystals. Cleavage: Indistinct. Specific gravity: 3.2-3.8.
- Hardness
- 7-7
- Color
- Black
- Luster
- Vitreous to submetallic
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Physical properties
Hardness: 7-7.5 on the Mohs scale. Color: Black. Luster: Vitreous to submetallic. Crystal structure: Trigonal, commonly forming prismatic, striated columnar crystals. Cleavage: Indistinct. Specific gravity: 3.2-3.8.
Formation & geological history
Formed predominantly in pegmatites and hydrothermal veins, as well as in metamorphic environments like schists and gneisses, through high-temperature crystallization from mineral-rich fluids.
Uses & applications
Used in metaphysical collections, jewelry, electrical components due to its piezoelectric and pyroelectric properties, and as an industrial mineral.
Geological facts
Schorl makes up about 95% of all tourmaline found in nature. Its name is derived from an old village in Saxony, Germany.
Field identification & locations
Easily identifiable by its characteristic striated prismatic crystal faces, conchoidal fracture, and lack of good cleavage. Commonly found worldwide, including Brazil, Pakistan, and the United States.
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