Opal look-alikes
Opal (amorphous hydrated silica)
Got a photo? Identify rocks instantly with the Rockby app
Open the appSeveral rocks and minerals can be confused with Opal. 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: Cryptocrystalline Quartz
Quartz
SiO2
Also known as: Silica
Glass
Amorphous Silicate
Also known as: Volcanic Glass, Obsidian
Explore Opal
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.