Mineral

Tourmalinated Quartz

SiO2 with NaFe3+3Al6(BO3)3Si6O18(OH)4 inclusions

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale) for the quartz matrix. Color: Transparent to translucent clear or milky quartz with black needle-like inclusions. Luster: Vitreous. Crystal structure: Hexagonal (quartz) with trigonal inclusions (tourmaline). Cleavage: None (conchoidal fracture).

Hardness: 7 (Mohs scale) for the quartz matrix
Luster: Vitreous

Identified June 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed in pegmatites and hydrothermal veins where both silica-rich and boron-rich fluids crystallize together. The schorl (black tourmaline) needles grow in the cavity before or alongside the quartz.

Uses & applications

Used primarily in jewelry as a lapidary stone, carved into cabochons, pendants, and beads. Also collected by mineral enthusiasts.

Geological facts

The black needles are typically Schorl, the most common variety of tourmaline.

Field identification & locations

Identify by looking for clear to milky quartz with distinct, opaque black needle-like inclusions passing through it. Commonly found in Brazil, Madagascar, and parts of the USA.