metamorphic
Small rounded river pebble, possibly fine-grained quartzite
Unidentified silicate pebble; quartzite is a tentative visual identification
AI-generated identification · may be incorrectGray-brown, smooth and rounded, with a dull to slightly waxy luster and no visible crystals or cleavage. If quartzite, hardness is about 7 Mohs and its grains are interlocked quartz; the image alone cannot confirm composition or specific gravity.
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Physical properties
Gray-brown, smooth and rounded, with a dull to slightly waxy luster and no visible crystals or cleavage. If quartzite, hardness is about 7 Mohs and its grains are interlocked quartz; the image alone cannot confirm composition or specific gravity.
Formation & geological history
Likely naturally rounded by water or wave abrasion. If quartzite, it formed when quartz-rich sandstone was metamorphosed; its age and source are indeterminable from the photo.
Uses & applications
Primarily a natural curiosity or decorative pebble; comparable material may be used in landscaping and aggregate.
Geological facts
Pebble shape reflects prolonged abrasion and transport, but many different rocks can acquire this appearance.
Field identification & locations
A close view of a fresh break, hardness test, and streak or mineral analysis would help identify it; as shown, the smooth surface and uniform color are not diagnostic.
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