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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
Dimensions at widest points approximately 160 mm x 90 mm x 70 mm thick
Dimensions approximately 110 mm x 110 mm x 80 mm thick
From near Kalgoorlie
195 mm x 100 mm x 48 mm
Polished Green Opal rock GRN96 Rhodo The quartz epidote axinite mineralisationGRN96 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 120 mm x 55 mm x 35 mm thick Weighs 322 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.
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