Boulder Opal - Quilpie, Queensland, Australia
"Boulder opal consists of concretions and fracture fillings in a dark siliceous ironstone matrix. It is found sporadically in western Queensland."Via the Minerals Minerals Minerals! tumblr.
"Boulder opal consists of concretions and fracture fillings in a dark siliceous ironstone matrix. It is found sporadically in western Queensland."Via the Minerals Minerals Minerals! tumblr.
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