metamorphic
Quartz-rich pebble, likely quartzite
Quartzite (predominantly recrystallized quartz, SiO₂)
AI-generated identification · may be incorrectPale gray-white, dull to slightly sparkly, with a fine sugary texture and rounded, water-worn shape. Quartz hardness is 7 Mohs; quartzite has no prominent cleavage and a granular crystalline texture. Exact identification requires closer examination.
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Physical properties
Pale gray-white, dull to slightly sparkly, with a fine sugary texture and rounded, water-worn shape. Quartz hardness is 7 Mohs; quartzite has no prominent cleavage and a granular crystalline texture. Exact identification requires closer examination.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism. Its age cannot be determined from the image; the pebble was likely rounded by stream or coastal transport.
Uses & applications
Quartzite is used as crushed stone, paving and building material, and decorative stone. This small pebble is mainly suitable for collecting or landscaping.
Geological facts
Quartzite can resemble marble, but it is generally harder and does not fizz in dilute acid. A fresh break often cuts across, rather than around, individual grains.
Field identification & locations
Look for a hard, quartz-rich rock with a sugary sparkle; it should scratch glass and resist a steel knife. Quartzite occurs worldwide in metamorphic terrains and as transported river or beach pebbles.
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