Chert look-alikes
Sedimentary cryptocrystalline quartz
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Open the appSeveral 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
Microcrystalline quartz
Also known as: Agate, Onyx, Carnelian
Opal
Hydrated amorphous silica (SiO2·nH2O)
Also known as: Precious Opal, Common Opal
Quartzite
Metamorphosed sandstone
Also known as: Metaquartzite
Limestone
Calcium carbonate (CaCO3)
Also known as: Calcite rock
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