metamorphic
Quartzite
Quartzite, composed predominantly of recrystallized quartz (SiO₂)
AI-generated identification · may be incorrectTan to cream, coarse and granular with faint banding; typically Mohs 7, vitreous to dull luster, no distinct cleavage, and specific gravity about 2.65. The image is consistent with quartzite, though a photo cannot confirm composition.
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Physical properties
Tan to cream, coarse and granular with faint banding; typically Mohs 7, vitreous to dull luster, no distinct cleavage, and specific gravity about 2.65. The image is consistent with quartzite, though a photo cannot confirm composition.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized by heat and pressure, commonly during regional metamorphism; its age depends on the source rock and metamorphic event.
Uses & applications
Used as building and decorative stone, aggregate, paving, and sometimes countertops; this rough piece has little jewelry value.
Geological facts
Quartz grains interlock during metamorphism, making sound quartzite very hard and resistant to weathering.
Field identification & locations
Look for a hard, quartz-rich rock with interlocking grains; it may scratch glass and resist a steel knife. Common in metamorphic mountain belts worldwide.
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