Precious Opal look-alikes
Opal (SiO2·nH2O)
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Open the appSeveral rocks and minerals can be confused with Precious 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
Common Opal
Opal (SiO2·nH2O)
Also known as: Potch Opal
Chalcedony
SiO2
Also known as: Cryptocrystalline Quartz
Glass
Amorphous SiO2 and other oxides
Also known as: Man-made glass
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