sedimentary
Sandstone (Pebble / Cobble)
Arenite / Sedimentary Rock (composed of quartz and feldspar)
Hardness around 6-7 on Mohs scale depending on cementation; buff, tan, reddish-brown color; earthy to dull luster; granular clastic texture composed of sand-sized mineral particles.
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Physical properties
Hardness around 6-7 on Mohs scale depending on cementation; buff, tan, reddish-brown color; earthy to dull luster; granular clastic texture composed of sand-sized mineral particles.
Formation & geological history
Formed by the compaction and cementation of sand grains, typically in ancient riverbeds, lakes, or marine environments, then naturally rounded over time by water action.
Uses & applications
Commonly used as construction aggregate, landscaping stone, and architectural building material.
Geological facts
Rounded quartz sand pebbles are remarkably durable and can survive multiple cycles of erosion, transport, and re-deposition over millions of years.
Field identification & locations
Look for a rough, sand-like texture when examined closely or with a hand lens. Extremely common in riverbeds, glacial deposits, and coastal shores worldwide.
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