metamorphic
Blue Quartzite (Blue Aventurine)
Silicon Dioxide with Dumortierite/Crocidolite inclusions (SiO2)
Hardness: 7 (Mohs scale), Color: Deep denim or muddled blue, Luster: Vitreous to dull when polished, Crystal structure: Hexagonal (trigonal) macrocrystalline, Cleavage: None, Specific gravity: 2.6 - 2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Deep denim or muddled blue, Luster: Vitreous to dull when polished, Crystal structure: Hexagonal (trigonal) macrocrystalline, Cleavage: None, Specific gravity: 2.6 - 2.7
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. The blue color is typically caused by inclusions of minerals such as Dumortierite or Crocidolite during the recrystallization process under high pressure and temperature.
Uses & applications
Used primarily for ornamental purposes, such as tumbled stones, beads for jewelry, carvings, and as a decorative architectural stone.
Geological facts
While pure quartz is clear, blue quartzite is prized for its soothing color. It is often referred to as Blue Aventurine when it exhibits a slight shimmering effect (aventurescence) due to mineral inclusions.
Field identification & locations
Identify by its hardness (will scratch glass) and lack of distinct white calcite veins found in similar-looking Sodalite or Lapis Lazuli. Found commonly in Brazil, India, and Russia.
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