mineral
Quartz with Schorl inclusions
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)
Hardness: 7 (Mohs); Color: Grayish-white translucent quartz with dark black metallic patches; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)
- Hardness
- 7 (Mohs)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs); Color: Grayish-white translucent quartz with dark black metallic patches; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed in granitic pegmatites or hydrothermal veins where silica-rich fluids cooled alongside boron-rich minerals. Found in igneous and metamorphic environments worldwide.
Uses & applications
Used as a semi-precious gemstone in jewelry, as a healing crystal in metaphysical practices, and as a decorative mineral specimen for collectors.
Geological facts
Black tourmaline (Schorl) is often found penetrating quartz crystals; it is the most common member of the tourmaline group, making up nearly 95% of all tourmaline found in nature.
Field identification & locations
Identify by its characteristic 7 hardness (scratches glass) and the distinct needle-like or blocky black inclusions that do not scratch with steel. Commonly found in pegmatite fields in Brazil, Madagascar, and the USA.
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