metamorphic
White quartzite pebble
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectSmooth, rounded, white to pale gray, with a dull to slightly glassy luster and no visible cleavage. Quartz has Mohs hardness 7; quartzite is dense and typically scratches glass, though the image alone cannot confirm its identity.
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Physical properties
Smooth, rounded, white to pale gray, with a dull to slightly glassy luster and no visible cleavage. Quartz has Mohs hardness 7; quartzite is dense and typically scratches glass, though the image alone cannot confirm its identity.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure, welding quartz grains together. The pebble was likely rounded by river or beach transport; its geological age and source cannot be determined from the image.
Uses & applications
Used as decorative landscaping stone, in gardens and aquariums, and occasionally as a lapidary or collecting specimen; quartzite also serves as aggregate and building stone.
Geological facts
Quartzite often breaks across its grains rather than around them, unlike sandstone. This small, uniformly pale pebble may also be another hard, light-colored stone, so visual identification is provisional.
Field identification & locations
Look for a hard, compact texture and a sugary or fused quartz-grain appearance; it commonly occurs in streambeds and beaches. Estimated value: about $1–$5 as an ordinary pebble, more if polished or especially attractive.
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