metamorphic
Rounded quartzite pebble
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectCream-white, rounded, and fine-grained with a dull to slightly sugary luster; quartz hardness is 7 Mohs, with no cleavage and a granular crystal structure. Exact composition cannot be confirmed from the image alone.
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Physical properties
Cream-white, rounded, and fine-grained with a dull to slightly sugary luster; quartz hardness is 7 Mohs, with no cleavage and a granular crystal structure. Exact composition cannot be confirmed from the image alone.
Formation & geological history
Likely formed when quartz-rich sandstone was compacted and recrystallized during metamorphism; quartzite occurs in rocks of many geological ages. Its smooth shape is consistent with abrasion during transport by water or ice.
Uses & applications
Quartzite is used as crushed aggregate, paving and building stone, and—when attractive and sound—as decorative stone or a lapidary material.
Geological facts
Quartzite is much harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for a hard, quartz-rich pebble with interlocking grains and no obvious layering; common in river, beach, and glacial deposits sourced from quartzite outcrops. A scratch test or close inspection is needed to distinguish it confidently from other pale pebbles.
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