mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
AI-generated identification · may be incorrectHardness: 7 (Mohs), Color: Clear to smoky quartz with golden or reddish-brown needle-like inclusions, Luster: Vitreous, Crystal structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: Clear to smoky quartz with golden or reddish-brown needle-like inclusions, Luster: Vitreous, Crystal structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins and pegmatites when titanium-rich fluids crystallize as rutile needles within growing quartz crystals. Geological age varies by location, often millions of years old.
Uses & applications
Primarily used in jewelry (cabochons and faceted stones), as ornamental carvings, and in mineral collecting.
Geological facts
The needles are known as 'Venus hair stone' or 'Cupid's darts.' The rutile needles can be so dense they make the quartz appear opaque or give it a metallic sheen.
Field identification & locations
Identify by needle-like inclusions within a transparent/translucent quartz host. Commonly found in Brazil, Madagascar, and Sri Lanka. Collectors look for high clarity and well-defined needle patterns.
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