Polished Green Opal slab GRN109 fossil stromatolite Prase is a chrome-rich chert

Prase is a chrome-rich chert

BJ134  Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt)

It weighs 202 grams

Dimensions at widest points approximately 170 mm  x 75 mm wide x 9 mm thick

Dimensions at widest points approximately 180 mm x 75 mm x 8 mm thick

Polished Green Opal slab GRN109 fossil stromatolite Prase is a chrome-rich chertGRN109 Green Opal slab, cut and polished on one side . Dimensions at widest points approximately 95 mm x 70 mm x 11 mm thick Weighs 144 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.