metamorphic
Weathered quartz-rich metamorphic pebble
Likely quartzite or quartz-rich schist; predominantly SiO₂ (quartz)
AI-generated identification · may be incorrectHardness about 7 for quartz; pale gray-beige, granular, with dull to subtly vitreous luster and no obvious cleavage. The rounded shape and surface pitting indicate water abrasion and weathering.
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Physical properties
Hardness about 7 for quartz; pale gray-beige, granular, with dull to subtly vitreous luster and no obvious cleavage. The rounded shape and surface pitting indicate water abrasion and weathering.
Formation & geological history
Probably derived from metamorphosed sandstone or quartz-rich sediment, recrystallized during regional metamorphism; its exact geological age cannot be determined from the photograph. It was later eroded into a stream or beach pebble.
Uses & applications
Suitable mainly as a teaching or collection specimen; quartzite can be used as aggregate, paving stone, or building material, though this small pebble has no practical industrial value.
Geological facts
Quartzite is typically tougher and more resistant to weathering than sandstone. A steel knife generally will not scratch fresh quartz-rich surfaces, while quartz can scratch ordinary glass.
Field identification & locations
Common in stream gravels and glacial deposits worldwide, especially near exposed metamorphic terrains. Confirm by testing for glass-scratching hardness and checking whether grains are fused rather than loosely cemented.
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