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Gemstones, Minerals & Fossils
Gemstones and Minerals
Opals found in Lockyer valley
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<blockquote data-quote="blisters" data-source="post: 295616" data-attributes="member: 4992"><p>Concretions are not uncommon but for opal you'd see some evidence of potch at least. You require silica for opal.</p><p>Jon</p></blockquote><p></p>
[QUOTE="blisters, post: 295616, member: 4992"] Concretions are not uncommon but for opal you'd see some evidence of potch at least. You require silica for opal. Jon [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Opals found in Lockyer valley
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