metamorphic
Mixed polished river pebbles, predominantly quartzite and quartz
Quartzite (SiO₂), quartz (SiO₂), with possible feldspar-rich and iron-stained lithologies
AI-generated identification · may be incorrectRounded, tumbled stones with white, cream, gray, and brown colors; mostly vitreous to dull luster and massive, non-cleaved texture. Quartz-rich pieces have Mohs hardness about 7 and specific gravity near 2.65; exact properties vary by pebble.
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Physical properties
Rounded, tumbled stones with white, cream, gray, and brown colors; mostly vitreous to dull luster and massive, non-cleaved texture. Quartz-rich pieces have Mohs hardness about 7 and specific gravity near 2.65; exact properties vary by pebble.
Formation & geological history
These are likely naturally water-rounded alluvial pebbles, later polished or wet-finished. Quartzite formed when quartz-rich sandstone recrystallized under heat and pressure, commonly during Precambrian to younger mountain-building events; the set is not a single geological specimen.
Uses & applications
Used for landscaping, crafts, decoration, aquarium substrates, and lapidary work; attractive pieces may be tumbled for inexpensive jewelry or display.
Geological facts
The smooth shape primarily records abrasion in streams or beaches rather than the rock’s original formation. White pebbles may be quartz or quartzite, while brown coloration commonly reflects iron-oxide staining.
Field identification & locations
Identify quartzite by its sugary interlocking texture and inability to scratch it with a steel knife; quartz pebbles are glassy and may fracture conchoidally. Common worldwide in river gravels, beaches, and glacial deposits.
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