Clay look-alikes
Clay mineral group
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Open the appSeveral rocks and minerals can be confused with Clay. 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
Shale
Shale (composed predominantly of clay minerals and silt-sized particles)
Also known as: Mudstone, Claystone
Siltstone
Siltstone (composed predominantly of silt-sized particles, often with clay matrix)
Also known as: Silt rock
Loess
Loess (unstratified, porous, friable deposit of predominantly silt-sized particles, often with clay)
Also known as: Wind-blown silt
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