Polished Magnesite slab. MAP153 microbialite OG152 Polished orbicular granite with

OG152   Polished orbicular granite with natural rough back

Weighs 192 grams

4 billion years

120mm x 100mm x 30-50mm 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

Polished Magnesite slab. MAP153 microbialite OG152 Polished orbicular granite withMAP153. 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.