Polished Magnesite slab. MAP153 microbialite DO170 Dendritic Opal rough rock

DO170  Dendritic Opal rough rock

Weighs 945 grams

Dimensions approximately 160mm x 65mm x 10mm thick

The quartz epidote axinite mineralisation was evidently caused by hydrothermal activity related to the doleritic sills which are in close proximity to the occurrence

4 billion years

Polished Magnesite slab. MAP153 microbialite DO170 Dendritic Opal rough rockMAP153. Magnesite (Lemon chrysoprase) slab polished on one side. The subtle lime green colouration is caused by the presence of nickel mineralisation. Dimensions at widest points approximately 145 mm x 80 mm x 7. 5 mm thick. Weighs 170 grams. From Yerilla, north of Kalgoorlie, Western Australia.