mineral

Rutilated Quartz

Silicon Dioxide with Titanium Dioxide (SiO2 with TiO2 inclusions)

Hardness: 7 (Mohs); Color: Clear with gold, silver, or reddish-brown needle-like inclusions; Luster: Vitreous; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.65.

Hardness: 7 (Mohs)
Luster: Vitreous

Identified May 1, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs); Color: Clear with gold, silver, or reddish-brown needle-like inclusions; Luster: Vitreous; Crystal structure: Trigonal; Cleavage: None; Specific gravity: 2.65.

Formation & geological history

Formed in hydrothermal veins and pegmatites through the precipitation of silica while rutile crystals were already present or growing simultaneously. Found globally in geological formations from various ages.

Uses & applications

Primarily used in jewelry (cabochons and beads), carvings, and as a popular collector's mineral specimen. Also utilized in metaphysical practices.

Geological facts

The needle-like inclusions are known as 'Venus hair.' While rutile is usually a dark mineral, when encased in quartz, it often appears brilliant gold or metallic. Each pattern of needles is unique to that specific stone.

Field identification & locations

Identify by looking for hair-like mineral inclusions trapped inside clear or smoky quartz. Common locations include Brazil and Madagascar. For collectors, higher transparency of the quartz and density of the rutile increase value.

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