metamorphic

Quartz-rich pebble (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂); identification from the photo is provisional

AI-generated identification · may be incorrect

Small rounded, tan-gray pebble with a rough, granular surface and pale quartz-rich patches. Quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure; individual grains are not clear enough here to confirm the rock type.

Identified September 29, 2026More metamorphic →

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Physical properties

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; rounded edges suggest transport by water or other abrasion.

Uses & applications

Quartzite is used as building and paving stone, aggregate, and sometimes decorative stone; this small pebble is mainly suitable for collecting.

Geological facts

Quartzite is generally very hard and commonly resists weathering, making it frequent in river and beach gravels.

Field identification & locations

Look for a hard, interlocking quartz texture; quartzite typically scratches glass and does not split into thin layers. Similar pebbles occur in streambeds and glacial deposits worldwide.