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The quartz epidote axinite mineralisation was evidently caused by hydrothermal activity related to the doleritic sills which are in close proximity to the occurrence
A slab polished on one side
Weighs 740 grams
170 mm x 100 mm x 9 mm
Conophyton garganicum australe from the Mesoproterozoic "Top Camp Formation"
Polished Green Opal rock GREEN76 polished jasper The quartz epidote axinite mineralisationGREEN76 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 130 mm x 130 mm x 50 mm thick Weighs 1,238 grams Green Opal occurs at a location south of Kalgoorlie in the Eastern Goldfields of Western Australia. The green colouration is caused by traces of nickel and or chromium. Sometimes it exhibits striking contrasting veins of magnesite.