Precious Opal (Var: Boulder Opal)

Specimen ID: RFC-YK0

Mineral(s)
Precious Opal (Var: Boulder Opal) : SiO2·nH2O
Locality
Mindat locality:
Events

Photo added to mindat.org

The field of view of this sample of Koroit opal is about 5mm, and the sample is from the bottom level of the Urlich mine.
Charles Calkins - 10th June 2012

Photo added to mindat.org

This sample of Koroit opal is 27mm long and is from the bottom level of the Urlich mine.
Charles Calkins - 10th June 2012
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