Polished Porphyry . PO 123 Green Opal Dimensions approximately 180 mm x

Dimensions approximately 180 mm x 65 mm x 6 mm thick

Packsaddle Tiger Eye slab

Very rare fossil stromatolite slab polished on one side

70 million years (Cretaceous)

from the Proterozoic "Duck Creek Dolomite"

Polished Porphyry . PO 123 Green Opal Dimensions approximately 180 mm xPO123. Pink porphyry slab, cut and polished on one side. From Mindoolah, Western Australia. Dimensions at widest points approximately 140 mm x 80 mm x 8. 5 mm thick. Weighs 188 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