Chert look-alikes

Sedimentary rock (microcrystalline quartz)

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Several rocks and minerals can be confused with Chert. 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

Chalcedony

SiO2

Also known as: Agate, Onyx, Carnelian

Jasper

Microcrystalline Quartz (SiO2)

Also known as: Red Chert

Flint

Microcrystalline Quartz (SiO2)

Also known as: Black Chert

Novaculite

Microcrystalline Quartz (SiO2)

Also known as: Arkansas Stone

Opal

SiO2·nH2O

Also known as: Hydrated Amorphous Silica

Explore Chert

Overview

Full guide to Chert

Identification

Localities & Collecting

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