metamorphic
Iron-stained quartz-rich rock (likely quartzite)
Quartzite, predominantly SiO₂, with iron-oxide staining or a dark mineral-rich band
AI-generated identification · may be incorrectCream to tan, rough and granular, with a dark brown band; likely Mohs 7 if quartzite. The small, weathered specimen does not show enough detail to confirm its texture or mineral composition.
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Physical properties
Cream to tan, rough and granular, with a dark brown band; likely Mohs 7 if quartzite. The small, weathered specimen does not show enough detail to confirm its texture or mineral composition.
Formation & geological history
Quartz-rich sandstone transformed by heat and pressure into interlocking quartz grains; iron oxides can stain or band the rock. Its age and precise formation setting cannot be determined from the image.
Uses & applications
Quartzite is used as building and paving stone, aggregate, and decorative stone; this small fragment is mainly a collecting specimen.
Geological facts
Quartzite is hard and typically resists scratching by a steel knife; unlike sandstone, it tends to fracture through quartz grains rather than around them.
Field identification & locations
Quartz-rich texture and hardness would support quartzite identification, but the pictured banded fragment could also be another iron-stained rock. Quartzite occurs worldwide in metamorphic terrains.
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