Boulder Opal look-alikes

Opal in matrix (SiO2·nH2O)

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Several rocks and minerals can be confused with Boulder 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

Black Opal

Opal (SiO2·nH2O)

Also known as: Dark Opal

White Opal

Opal (SiO2·nH2O)

Also known as: Light Opal

Matrix Opal

Opal (SiO2·nH2O) in host rock

Also known as: Andamooka Matrix Opal

Explore Boulder Opal

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Full guide to Boulder Opal

Identification

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