sedimentary
Sandstone Pebble
Arenite / Quartz Sandstone
AI-generated identification · may be incorrectMohs hardness 6–7 (dominated by quartz); earthy to dull luster; gritty, fine- to medium-grained texture with a brownish-tan color.
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Physical properties
Mohs hardness 6–7 (dominated by quartz); earthy to dull luster; gritty, fine- to medium-grained texture with a brownish-tan color.
Formation & geological history
Formed by the compaction and cementation of mineral particles and rock fragments, later rounded and smoothed by fluvial or glacial transport.
Uses & applications
Used primarily in building construction, paving, landscaping, and as raw material for aggregate and concrete.
Geological facts
Naturally rounded river rocks or pebbles develop their smooth, oblong shapes over decades or centuries through hydraulic tumbling and abrasion against other rocks.
Field identification & locations
Identifiable by its gritty sandpaper-like feel, rounded fluvial profile, and visible granular matrix; commonly found in riverbeds, beaches, and glacial outwashes.
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