mineral
Blue Quartz
Silicon dioxide (SiO2) with inclusions
AI-generated identification · may be incorrectHardness 7 on Mohs scale. Color: Blue-grey to indigo. Luster: Vitreous to waxy. Crystal system: Trigonal. Specific gravity: 2.65.
- Color
- Blue-grey to indigo
- Luster
- Vitreous to waxy
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Physical properties
Hardness 7 on Mohs scale. Color: Blue-grey to indigo. Luster: Vitreous to waxy. Crystal system: Trigonal. Specific gravity: 2.65.
Formation & geological history
Formed in igneous or metamorphic environments where inclusions such as crocidolite, tourmaline, or rutile create a blue hue through the Rayleigh scattering of light.
Uses & applications
Used primarily in decorative applications, jewelry making, lapidary arts, and as a collector's specimen. Sometimes used in ornamental landscaping.
Geological facts
Unlike many blue gemstones, the color in blue quartz is usually caused by the scattering of light from microscopic inclusions rather than chemical substitution in the quartz lattice.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and the characteristic 'denim' blue color that often appears slightly hazy or opaque. Commonly found in Brazil and Virginia (USA).
