metamorphic
Rounded quartz-rich pebble
Likely quartzite, composed mainly of quartz (SiO₂)
AI-generated identification · may be incorrectWhite to pale beige, opaque, with a dull to slightly vitreous luster and a rounded, weathered surface. Quartz hardness is 7 Mohs; the image does not reveal crystal structure or confirm the rock type.
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Physical properties
White to pale beige, opaque, with a dull to slightly vitreous luster and a rounded, weathered surface. Quartz hardness is 7 Mohs; the image does not reveal crystal structure or confirm the rock type.
Formation & geological history
Quartzite forms when quartz sandstone is recrystallized by heat and pressure during metamorphism; its age and source cannot be determined from the photo.
Uses & applications
Commonly used as decorative landscaping stone, aggregate, and a lapidary or collecting specimen.
Geological facts
Quartzite is exceptionally resistant to weathering, so it often survives as smooth pebbles in rivers and on beaches.
Field identification & locations
The pale color and compact appearance fit quartzite, but a scratch test and fresh broken surface would help distinguish it from milky quartz or other pale rocks. Quartz-rich pebbles occur worldwide in river, beach, and glacial deposits.
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