metamorphic
Smooth, water-worn pebble (likely quartzite)
Quartzite, composed predominantly of recrystallized quartz (SiO₂)
AI-generated identification · may be incorrectRounded, opaque cream-white pebble with rusty-brown staining; quartz-rich rocks have Mohs hardness around 7 and a glassy to dull luster. The image does not show enough detail to confirm quartzite or assess its texture definitively.
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Physical properties
Rounded, opaque cream-white pebble with rusty-brown staining; quartz-rich rocks have Mohs hardness around 7 and a glassy to dull luster. The image does not show enough detail to confirm quartzite or assess its texture definitively.
Formation & geological history
Quartzite forms when quartz sandstone is recrystallized by heat and pressure during metamorphism; its age and source cannot be determined from the image. Rounding and smoothing likely occurred through transport in water.
Uses & applications
Quartzite is used as building and paving stone, aggregate, and sometimes decorative stone; this small pebble has little commercial value but may be a keepsake or landscaping material.
Geological facts
Rust-colored patches commonly result from iron-oxide staining. A simple hardness test on an inconspicuous spot can help distinguish quartz-rich stone from softer lookalikes.
Field identification & locations
Its smooth, rounded shape suggests water transport, but visual identification is uncertain; test whether it scratches glass and inspect a freshly broken surface for interlocking quartz grains. Quartzite and similar pebbles occur in riverbeds, beaches, and glacial deposits.
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