metamorphic

Rounded iron-stained quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂), with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; brown to rusty tan, with a dull to slightly sparkling granular surface and no obvious cleavage. The rounded shape and visible quartz-rich texture are consistent with a water-worn pebble; identification from the photo is provisional.

Identified September 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone was cemented and recrystallized during metamorphism; its precise age and source cannot be determined from the image. The rounded form likely reflects transport and abrasion in a river or shoreline setting.

Uses & applications

Quartzite is used as crushed stone, paving and building stone, and sometimes as a decorative material; this specimen is mainly suitable for collecting.

Geological facts

Quartzite is harder and more resistant to weathering than its sandstone precursor, and typically breaks across quartz grains rather than around them.

Field identification & locations

Look for a hard, quartz-rich texture and test whether it scratches glass; iron oxides can create rusty brown colors. Quartzite occurs worldwide in metamorphic terrains and stream gravels.