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Pink porphyry slab
TIR134 Tiger Iron rough rock
MN124 Magneprase slab
form of Pseudogymnosolenid type
CC146 Chrome chalcedony slab
Polished Green Opal rock GREEN85 asperia ashburtonia Pink porphyry slabGREEN85 Green Opal & Magnesite rough rock, cut and polished on one side with a rough, naturally weathered back Dimensions at widest points approximately 170 mm x 70 mm x 50 mm thick Weighs 622 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.