metamorphic
Weathered quartzite
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectTan to cream, rough and massive with subtle bands; likely Mohs hardness 7, vitreous to dull luster, interlocking quartz grains, and no prominent cleavage. The photo alone cannot confirm the identification; similar weathered sandstone is possible.
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Physical properties
Tan to cream, rough and massive with subtle bands; likely Mohs hardness 7, vitreous to dull luster, interlocking quartz grains, and no prominent cleavage. The photo alone cannot confirm the identification; similar weathered sandstone is possible.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure, typically during regional metamorphism; its age depends on the source rock and metamorphic event.
Uses & applications
Used as dimension stone, landscaping aggregate, road material, and occasionally decorative stone.
Geological facts
Quartzite is typically harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for interlocking quartz grains and fracture surfaces that cut across grains rather than around them; found in metamorphic belts worldwide. A hand lens and hardness test help distinguish it from sandstone.
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