metamorphic
Blue quartzite (likely)
Quartzite, composed predominantly of quartz (SiO₂); blue coloration may come from inclusions or surface treatment
AI-generated identification · may be incorrectBlue-gray, rough and granular with pale patches; quartz has Mohs hardness 7 and vitreous luster. The image does not reveal crystal structure or confirm whether the color is natural.
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Physical properties
Blue-gray, rough and granular with pale patches; quartz has Mohs hardness 7 and vitreous luster. The image does not reveal crystal structure or confirm whether the color is natural.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure; this process occurs in many geological ages and mountain-building settings.
Uses & applications
Quartzite is used as building and decorative stone, aggregate, and sometimes in landscaping or lapidary work.
Geological facts
True quartzite is hard and resists scratching; the blue appearance alone is not diagnostic and may instead indicate another rock or treated material.
Field identification & locations
Look for interlocking quartz grains and a surface that scratches glass; common sources include metamorphic mountain belts worldwide. A photo cannot establish the exact identification.
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