Clay look-alikes

Hydrous phyllosilicates

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Several 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

Also known as: Mudstone (if not fissile)

Siltstone

Also known as: Fine-grained clastic sedimentary rock

Loess

Also known as: Wind-blown silt

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Overview

Full guide to Clay

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