metamorphic
Polished white-and-gray pebble, likely quartz-rich stone
Possibly milky quartz or quartzite (SiO₂); the image is insufficient for a definitive identification
AI-generated identification · may be incorrectRounded, smooth pebble with a white-gray mottled surface and dark inclusions. If quartz-rich, hardness is about 7 Mohs, with vitreous to dull luster and no cleavage; crystal structure is trigonal.
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Physical properties
Rounded, smooth pebble with a white-gray mottled surface and dark inclusions. If quartz-rich, hardness is about 7 Mohs, with vitreous to dull luster and no cleavage; crystal structure is trigonal.
Formation & geological history
Could be quartz vein material or quartzite formed by metamorphism of sandstone, later rounded by water or abrasion. Its age and exact formation environment cannot be determined from the image.
Uses & applications
Commonly used as a decorative pebble, landscaping stone, or craft material; this specimen appears to have little commercial value.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, allowing quartz-rich stones to persist as rounded stream pebbles.
Field identification & locations
Quartz-rich pebbles are widespread in river gravels and beaches. A hardness test or examination of a fresh surface would help distinguish quartz/quartzite from other pale stones.
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