Yowah Boulder Opal Rough | 13.9g | Australia Dreaming offering vibrant colour and a

offering vibrant colour and a smooth

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Yowah Boulder Opal Rough | 13.9g | Australia Dreaming offering vibrant colour and aYowah Boulder Opal Rough 13. 9g Australia A natural Yowah Boulder Opal rough specimen weighing 13. 9g from Yowah, Queensland, Australia. Each piece is completely unique, displaying natural flashes of colour set within its ironstone matrix. One available. Sold as seen. Boulder Opal is a hydrated silicon dioxide mineraloid that forms when silica rich solutions fill natural cracks within ironstone host rock. Unlike seam opal, it remains attached to its