sedimentary
Rounded yellow river pebble
Likely quartz-rich sandstone or weathered chert; exact identification requires a hardness and acid test
AI-generated identification · may be incorrectPale yellow, fine-grained, smooth and well-rounded, with a dull to slightly earthy luster; likely hardness 5–7 Mohs and low visible porosity. No crystals, cleavage, or distinctive layering are visible.
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Physical properties
Pale yellow, fine-grained, smooth and well-rounded, with a dull to slightly earthy luster; likely hardness 5–7 Mohs and low visible porosity. No crystals, cleavage, or distinctive layering are visible.
Formation & geological history
Likely a stream- or beach-worn clast produced by prolonged abrasion and transport; its original sedimentary rock may be millions to hundreds of millions of years old, depending on source geology.
Uses & applications
Primarily used as a decorative pebble, landscaping stone, craft material, or aquarium stone; this ordinary specimen has little jewelry or commercial value.
Geological facts
The rounded shape indicates repeated tumbling by moving water or surf. Yellow coloration commonly comes from iron-oxide staining within quartz-rich rock.
Field identification & locations
Test with a steel nail: sandstone may scratch more easily, while chert resists scratching; dilute vinegar can distinguish carbonate rock if it fizzes. Common in river gravels, beaches, and glacial deposits worldwide.
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