metamorphic
Likely quartzite pebble
Quartzite, composed predominantly of recrystallized quartz (SiO₂)
AI-generated identification · may be incorrectGray-pink, fine- to medium-grained, with a dull to slightly sparkly surface and no obvious cleavage; quartz hardness is 7 Mohs. The rounded shape and visible grain texture are consistent with a water-worn pebble, though a photo alone cannot confirm the identification.
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Physical properties
Gray-pink, fine- to medium-grained, with a dull to slightly sparkly surface and no obvious cleavage; quartz hardness is 7 Mohs. The rounded shape and visible grain texture are consistent with a water-worn pebble, though a photo alone cannot confirm the identification.
Formation & geological history
Forms when quartz-rich sandstone is metamorphosed and its grains fuse together; quartzite ranges from ancient to geologically recent depending on its source terrain.
Uses & applications
Commonly used as decorative gravel, landscaping stone, paving, and aggregate; attractive pieces may be kept as specimens.
Geological facts
Quartzite is typically much harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for interlocking quartz grains and a hard surface that resists scratching by a steel knife; common in river and beach gravels sourced from quartzite-bearing regions. The image does not show enough detail for a definitive identification.
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