igneous
Weathered quartz-rich pebble
Quartz-bearing granitoid or quartzite; exact identification is uncertain from the image
AI-generated identification · may be incorrectPale gray-beige, fine-grained, dull to slightly sugary luster, with possible quartz and feldspar grains; hardness likely 6–7 Mohs and no obvious cleavage. Rounded edges indicate water or surface weathering.
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Physical properties
Pale gray-beige, fine-grained, dull to slightly sugary luster, with possible quartz and feldspar grains; hardness likely 6–7 Mohs and no obvious cleavage. Rounded edges indicate water or surface weathering.
Formation & geological history
Likely eroded from an older igneous or metamorphic rock and transported by sediment or shoreline processes; its age cannot be determined visually and may range from millions to billions of years.
Uses & applications
Common examples are used as aggregate, landscaping stone, road material, and occasionally decorative specimens; this piece has little commercial value unless testing reveals an unusual composition.
Geological facts
The granular texture and pale color are consistent with quartz-rich rock, but the photograph does not resolve individual minerals or exclude a weathered feldspar-rich pebble.
Field identification & locations
Look for visible interlocking quartz grains, feldspar, and mica; a glassy scratch-resistant surface and inability to scratch quartz support a quartz-rich identity. Common in river gravels, beaches, and glacial deposits.
