Chert look-alikes
Chert (microcrystalline 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
SiO2
Also known as: Agate, Onyx, Carnelian
Jasper
Microcrystalline Quartz (with iron oxides)
Also known as: Red Jasper, Green Jasper
Flint
Microcrystalline Quartz
Also known as: Black Chert
Opal
SiO2·nH2O
Also known as: Precious Opal, Common Opal
Quartzite
Metamorphosed Quartz Sandstone
Also known as: Metaquartzite
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