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mineral > metamorphic mineral > secondary mineral formed by terrestrial weathering > terrestrially weathered meteorite mineral > terrestrially weathered iron meteorite mineral > opal
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opal comparison table
Subject is an instance of is a kind of
terrestrially weathered iron meteorite mineral terrestrially weathered meteorite mineral
opalterrestrially weathered iron meteorite mineral 

Next terrestrially weathered iron meteorite mineralpecoraite    Upterrestrially weathered iron meteorite mineral    Previous terrestrially weathered iron meteorite mineralisocubanite