igneous
Weathered quartz-rich pebble
Likely quartzite or milky vein quartz; exact identification is uncertain from the image
AI-generated identification · may be incorrectCream to pale yellow, opaque, and rounded with a dull to slightly sugary luster. If quartzite, it is mainly interlocking quartz (SiO₂), Mohs hardness about 7, with no prominent cleavage; a quartz pebble has the same hardness and composition but may show crystalline texture.
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Physical properties
Cream to pale yellow, opaque, and rounded with a dull to slightly sugary luster. If quartzite, it is mainly interlocking quartz (SiO₂), Mohs hardness about 7, with no prominent cleavage; a quartz pebble has the same hardness and composition but may show crystalline texture.
Formation & geological history
Likely naturally rounded by stream or beach transport from quartz-rich bedrock. Quartzite forms when sandstone is metamorphosed; its age depends on the source rock and cannot be determined from the image.
Uses & applications
Usually collected as a decorative pebble; quartzite may also be used as aggregate, paving, or building stone. This specimen does not show gem-grade features.
Geological facts
Quartz-rich stones resist weathering, so they commonly persist as rounded pebbles after softer surrounding rocks break down.
Field identification & locations
Its pale color, hardness, and lack of obvious grains suggest quartz-rich material, but a fresh break or close-up would help distinguish quartzite from massive vein quartz. Such pebbles occur widely in river and coastal gravels.
