metamorphic
Blue Quartzite
Metamorphic Rock (rich in Quartz, SiO2 with inclusions of Dumortierite or Magnesio-riebeckite)
Hardness: 7 (Mohs scale), Color: Sky blue to grayish blue, Luster: Vitreous to dull, Crystal Structure: Trigonal (granular texture), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Sky blue to grayish blue, Luster: Vitreous to dull, Crystal Structure: Trigonal (granular texture), Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone subjected to high heat and pressure, causing recrystallization. The blue color often comes from inclusions of blue minerals.
Uses & applications
Used primarily for decorative purposes, landscape stone, jewelry (cabochons), and sometimes as crushed stone in construction.
Geological facts
Unlike اکثر blue minerals, the color in blue quartzite is often caused by microscopic inclusions of other minerals rather than the chemical composition of the quartz itself. It is extremely durable and weather-resistant.
Field identification & locations
Identify by its ability to scratch glass and its grainy, crystalline texture that sparkles under light. Common in Brazil, India, and parts of the United States like the Blue Ridge Mountains.
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