mineral

Tourmalinated Quartz

Crystalline Silicon Dioxide with Schorl inclusions (SiO2 + NaFe3Al6(BO3)3Si6O18(OH)4)

Hardness: 7 (Quartz) and 7-7.5 (Tourmaline); Color: Clear to white with black needles; Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Indistinct; Specific Gravity: 2.65-3.1

Hardness: 7 (Quartz) and 7-7
Color: Clear to white with black needles
Luster: Vitreous

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 7 (Quartz) and 7-7.5 (Tourmaline); Color: Clear to white with black needles; Luster: Vitreous; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Indistinct; Specific Gravity: 2.65-3.1

Formation & geological history

Formed in pegmatites or hydrothermal veins where hot, mineral-rich fluids crystallize over long periods. As the quartz grows, it traps pre-existing tourmaline crystals (usually Schorl) within its matrix. Found in Precambrian to Cenozoic geological environments.

Uses & applications

Primarily used in jewelry (cabochons, beads, carvings), as healing crystals, and as decorative collector specimens. Some industrial use in electronics, though synthetic quartz is more common there.

Geological facts

Unlike rutilated quartz which features golden titanium oxide, tourmalinated quartz specifically contains black tourmaline. It is often referred to as 'The Yin-Yang Stone' in metaphysical circles due to its contrasting colors.

Field identification & locations

Identify by looking for distinct, needle-like black inclusions trapped inside a transparent or translucent quartz host. Common locations include Brazil, Madagascar, and the United States (California/Maine). It will scratch glass easily.

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