Polished Porphyry slab. PO 127 outback jasper 220 mm x 220 mm

220 mm x 220 mm x 50 mm thick

135 mm x 110 mm x 10 mm thick and weighs 295 grams

115 mm x 95 mm x 8

IRR 131    Fossil stromatolite slab

Dimensions at widest points approximately 260 mm x 150 mm and 10 mm thick

Polished Porphyry slab. PO 127 outback jasper 220 mm x 220 mmPO127. Pink porphyry slab, cut and polished on one side. From Mindoolah, Western Australia. Dimensions at widest points approximately 195 mm x 120 mm x 9. 4 mm thick. Weighs 469 grams. Porphyry is a general term that is used rather loosely for igneous rocks which contain relatively large isolated crystals set in a fine grained groundmass. The porphyry pictured here has pinkish coloured clinozoisite crystals set in a ground mass of dolerite. The