metamorphic

Iron-stained quartzite pebble

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

AI-generated identification · may be incorrect

Opaque, rounded tan-to-ochre pebble with a dull to slightly waxy surface; likely Mohs 7, with interlocking quartz grains and no distinct cleavage. Exact mineral identification is limited by the image.

Identified September 26, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone was recrystallized during metamorphism; iron oxides can color the stone yellow-brown. Its age and source cannot be determined from the photograph.

Uses & applications

Quartzite is used as decorative stone, paving and aggregate; small pebbles are mainly collected or used in crafts.

Geological facts

Quartzite is hard enough to scratch glass and typically breaks across its fused quartz grains rather than around them.

Field identification & locations

Look for a hard, quartz-rich texture and grain boundaries that do not crumble like sandstone; similar pebbles occur in stream and beach gravels worldwide. The pictured object could be another iron-stained rock, so a scratch test or close-up would help confirm it.