sedimentary
Sandstone (River Pebble)
Arenite / Quartzose Sandstone (primarily SiO2)
AI-generated identification · may be incorrectHardness 6-7 on the Mohs scale, earthy to dull luster, granular clastic texture, and tan-to-grayish coloration.
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Physical properties
Hardness 6-7 on the Mohs scale, earthy to dull luster, granular clastic texture, and tan-to-grayish coloration.
Formation & geological history
Formed through the compaction and cementation of mineral sand grains, followed by fluvial erosion that shaped and smoothed it into an ellipsoidal pebble.
Uses & applications
Commonly used in construction aggregate, landscaping, road beds, and occasionally carved for traditional stone craft.
Geological facts
Naturally rounded river pebbles like this from northern India's river systems (Indo-Gangetic plain) are frequently smoothed over thousands of years of transport from the Himalayas or Vindhyan ranges.
Field identification & locations
Identified by gritty sand-sized grains visible on the surface and smooth, rounded contours typical of river-bed transport. Highly abundant throughout river alluvium around Uttar Pradesh.
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