sedimentary
Pebble / Sandstone / Siltstone
Sedimentary Rock (Quartz Sandstone / Siltstone)
Mohs hardness around 6-7, dull to earthy luster, greyish-tan color, fine-grained texture with visible layering or a groove along the bedding plane.
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Physical properties
Mohs hardness around 6-7, dull to earthy luster, greyish-tan color, fine-grained texture with visible layering or a groove along the bedding plane.
Formation & geological history
Formed through the deposition, compaction, and cementation of mineral particles (primarily quartz and feldspar) in fluvial, lacustrine, or marine environments.
Uses & applications
Commonly used in construction aggregate, landscaping, or as garden stones. Smooth river-worn pebbles are often kept as simple decorative items.
Geological facts
River-worn pebbles get their smooth, rounded shapes from continuous abrasion against water and other rocks over long periods of time.
Field identification & locations
Look for visible grain structure, horizontal layering lines (bedding planes), and a non-shiny, earthy surface. Found in riverbeds, beaches, and gravel deposits worldwide.
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