sedimentary
Sandstone Cobble
Arenite / Quartz arenite
AI-generated identification · may be incorrectHardness 6-7 on the Mohs scale, earthy/dull luster, tan to light-brown color, fine-to-medium granular clastic texture.
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Physical properties
Hardness 6-7 on the Mohs scale, earthy/dull luster, tan to light-brown color, fine-to-medium granular clastic texture.
Formation & geological history
Formed through the compaction and cementation of mineral particles or rock fragments, subsequently smoothed by water or glacial transport.
Uses & applications
Used in general landscaping, construction aggregate, paving, and garden decor.
Geological facts
Naturally rounded river rocks or cobbles acquire their smooth shape from tumbling over many miles in ancient or modern waterways.
Field identification & locations
Identifiable by its gritty sandpaper feel, rounded oval shape, and subtle sedimentary layering; common in riverbeds and glacial deposits.
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