Unidentified Rocks look-alikes

Indeterminate Sedimentary/Metamorphic Rocks

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Several rocks and minerals can be confused with Unidentified Rocks. 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

Argillite

Also known as: Hardened Shale

Hornfels

Also known as: Contact Metamorphic Rock

Greywacke

Also known as: Dirty Sandstone

Siltstone

Also known as: Fine-grained Clastic Rock

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