Opal - Dubnik, Cervenica, Presov Co., Presov Region, Slovakia An old time example of precious opal f
Opal - Dubnik, Cervenica, Presov Co., Presov Region, Slovakia An old time example of precious opal from this historic locale in Slovakia - Up until the late 1800’s, when Australia’s opal fields were discovered, this historic deposit in Slovakia was once the world’s primary source of precious opal. This locality has been closed since 1922 and specimens are next to impossible to find. -- source link
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