Mineral

Rutile in Quartz (Rutilated Quartz)

SiO2 with TiO2 inclusions

AI-generated identification · may be incorrect

Hardness: Quartz (7 on Mohs scale), Rutile (6-6
Color: Quartz is typically clear, smoky, or milky
Luster: Vitreous (glassy) for quartz

Identified November 27, 2025More mineral →

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Physical properties

Hardness: Quartz (7 on Mohs scale), Rutile (6-6.5 on Mohs scale). Color: Quartz is typically clear, smoky, or milky. Rutile inclusions can be golden, red, brownish-red, or rarely green/black. Luster: Vitreous (glassy) for quartz; metallic to adamantine for rutile. Crystal Structure: Hexagonal (quartz); Tetragonal (rutile). Cleavage: None (quartz); Distinct (rutile, but rarely seen in inclusions). Specific Gravity: 2.65 g/cm³ (quartz); 4.2-4.3 g/cm³ (rutile).

Formation & geological history

Rutilated quartz forms when needle-like crystals of rutile (a titanium dioxide mineral) grow within quartz crystals during their formation. This often occurs in hydrothermal veins or pegmatites where silica-rich fluids cool and crystallize, often with titanium present. The exact geological age varies depending on the specific deposit, ranging from hundreds of millions to billions of years.

Uses & applications

Predominantly used in jewelry (beads, cabochons, carved pieces) due to its unique and striking appearance. It is also collected by mineral enthusiasts. Metaphysical communities often attribute various healing or energetic properties to it.

Geological facts

Rutile is one of the three mineral forms of titanium dioxide, the others being anatase and brookite. The needle-like inclusions are sometimes called 'angel hair' or 'Venus hair' by gem enthusiasts. The density and color of rutile needles can affect the overall appearance and value of the stone. Some rare forms include green or black rutile.

Field identification & locations

Identify by its characteristic transparent to translucent quartz host with visible, needle-like or hair-like inclusions of rutile. The color of the rutile can range from golden, red, brown, to rarely green. It's commonly found in Brazil (especially Minas Gerais), Australia, Madagascar, Russia, and the United States (e.g., North Carolina). In the field, look for quartz veins or pegmatites containing transparent quartz with unusual fibrous or needle-like inclusions. Polished specimens in jewelry are easily identified by these inclusions.

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