Chalcedony look-alikes
Chalcedony
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Open the appSeveral rocks and minerals can be confused with Chalcedony. 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
Quartz
Quartz (SiO2)
Also known as: Rock Crystal, Amethyst, Citrine, Rose Quartz, Smoky Quartz
Opal
Opal (SiO2·nH2O)
Also known as: Precious Opal, Common Opal, Fire Opal
Chert
Chert (cryptocrystalline quartz)
Also known as: Flint, Jasper (often considered a variety of chalcedony, but can also be chert)
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