metamorphic
Orange quartzite pebble
Quartzite, composed predominantly of quartz (SiO₂), with iron-oxide staining
AI-generated identification · may be incorrectRounded, opaque orange-pink pebble with a dull to slightly sugary surface; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The iron staining likely creates the warm color; exact identification from the image is uncertain.
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Physical properties
Rounded, opaque orange-pink pebble with a dull to slightly sugary surface; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The iron staining likely creates the warm color; exact identification from the image is uncertain.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure, welding quartz grains together. Its age depends on the source rock and metamorphic event; such pebbles commonly become rounded during transport in rivers or along beaches.
Uses & applications
Quartzite is used as construction and decorative stone, aggregate, and occasionally for carving or collecting; this small pebble has mainly modest specimen value.
Geological facts
Quartzite is hard enough to scratch glass, and unlike many sandstones it tends to fracture through its grains rather than around them.
Field identification & locations
Look for a hard, quartz-rich texture and a sugary sparkle on a broken surface; orange coloration commonly reflects iron oxides. Quartzite occurs worldwide in metamorphic terrains and river or beach gravels.
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