Chalcedony look-alikes
SiO2 (chalcedony)
Got a photo? Identify rocks instantly with the Rockby app
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
SiO2
Also known as: Rock Crystal, Amethyst, Citrine
Opal
SiO2·nH2O
Also known as: Precious Opal, Common Opal
Chert
Microcrystalline Quartz
Also known as: Flint
Explore Chalcedony
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.