metamorphic
Quartzite pebble with iron staining
Quartzite, composed mainly of recrystallized quartz (SiO₂)
AI-generated identification · may be incorrectMostly pale gray-white with reddish-brown iron-oxide staining; granular, nonmetallic luster and no obvious cleavage. Quartz has Mohs hardness 7; the small specimen’s specific gravity is typically about 2.6–2.7.
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Physical properties
Mostly pale gray-white with reddish-brown iron-oxide staining; granular, nonmetallic luster and no obvious cleavage. Quartz has Mohs hardness 7; the small specimen’s specific gravity is typically about 2.6–2.7.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized by heat and pressure, often during regional metamorphism. Its age cannot be determined from the image and may vary widely by source rock and metamorphic event.
Uses & applications
Quartzite is used as dimension stone, aggregate, and landscaping stone; attractive pieces may be collected or polished.
Geological facts
Quartz grains in quartzite are fused together, so it commonly breaks across grains rather than around them.
Field identification & locations
The image shows a rounded, light-colored pebble with rusty staining, consistent with quartzite, though visual identification alone is uncertain. Quartzite is common in metamorphic terrains worldwide; a glass-scratch test can help assess its hardness.
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