River Cobble look-alikes
Sedimentary Rock (e.g., Sandstone, Siltstone, or Shale) or Metamorphic Rock (e.g., Slate, Phyllite)
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Open the appSeveral rocks and minerals can be confused with River Cobble. Below are documented look-alikes and the features that tell them apart. Never rely on a single feature. Always check multiple properties.
Similar rocks to compare
Pebble
Clastic Sedimentary Rock (various types)
Also known as: River Pebble
Boulder
Clastic Sedimentary Rock (various types)
Also known as: River Boulder
Glacial Till
Diamictite (unlithified)
Also known as: Till
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