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Steeply dipping or vertical joint. Andamooka -rarely used, as little opal is found in verticals. Stuart Creek - generally infilled with pale yellow jarosite or alunite, and less frequently with gypsum. Coober Pedy - generally infilled with red-brown tubule material, gypsum, alunite, iron oxide, or opal. Mintabie - any near-vertical joint, the only discernible ones being infilled with opal, opaline silica or limonite.
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