mineral
Rounded quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly chalcedony or milky quartz
AI-generated identification · may be incorrectPale cream to tan, opaque to slightly translucent, with a dull-to-waxy luster and rounded water-worn shape. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the image is too blurred for precise identification.
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Physical properties
Pale cream to tan, opaque to slightly translucent, with a dull-to-waxy luster and rounded water-worn shape. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the image is too blurred for precise identification.
Formation & geological history
Likely weathered from a quartz-bearing igneous or metamorphic rock and rounded by stream or soil transport; its exact geological age and source cannot be determined visually.
Uses & applications
Common pebbles have little commercial use, though attractive chalcedony or quartz pieces may be polished for ornaments, cabochons, or collections.
Geological facts
Creamy mottling may reflect iron-oxide staining, impurities, or weathering rather than a distinct mineral species.
Field identification & locations
Test carefully with a steel file or glass: quartz should scratch glass and resist a steel knife; a streak test is generally white. Common worldwide in stream gravels, soils, and glacial deposits.
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