mineral

Tourmalinated Quartz

Quartz (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) inclusions

Hardness: 7 (Mohs); Color: Clear to translucent milky white with black needle-like or blocky inclusions; Luster: Vitreous; Crystal Structure: Hexagonal/Trigonal; Specific Gravity: 2.65.

Hardness: 7 (Mohs)
Luster: Vitreous

Identified April 11, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs); Color: Clear to translucent milky white with black needle-like or blocky inclusions; Luster: Vitreous; Crystal Structure: Hexagonal/Trigonal; Specific Gravity: 2.65.

Formation & geological history

Formed in pegmatites through hydrothermal processes where quartz and schorl tourmaline crystallize simultaneously under high heat and pressure, often millions of years ago.

Uses & applications

Primarily used in jewelry (beads, cabochons, carvings) and as a collector's specimen; also used in metaphysical practices.

Geological facts

The black inclusions are actually Schorl, which is the most common member of the tourmaline group. It is often called 'needle stone' when the inclusions are very fine.

Field identification & locations

Identify by the high hardness (cannot be scratched by steel) and the distinct, non-uniform black rods trapped inside the clear quartz. Found widely in Brazil, Madagascar, and the USA.

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