Polished Green Opal rock GREEN76 toredo IRR114 Fossil stromatolite slab polished

IRR114  Fossil stromatolite slab polished on one side

Interesting reddish colours

Dimensions approximately 75 mm x 55 mm x 18 mm thick

Weighs 165 grams

50 mm x 40 mm  x 22 mm

Polished Green Opal rock GREEN76 toredo IRR114 Fossil stromatolite slab polishedGREEN76 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.