Boulder Opal

Rough Bolder Opal piece from West QLD

11cm L x 9cm W x 2/4cm H

Purchased directly from the Opal miner.

Australia is the world’s most famous source of boulder opal. Much of it is in a brown ironstone with streaks and patches of precious opal. Some forms when precious opal infills fractures, or the cavities of concretions, invertebrate fossils, and petrified wood.