mineral

Quartz with Schorl inclusions

Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)

AI-generated identification · may be incorrect

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

Identified July 3, 2026More mineral →

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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.