Polished Porphyry . PO 123 Polished slab. OJ129 A rough rock

OJ129  A rough rock

From an unassigned unit of the Wyloo Group

Dimensions approximately 170mm x 100mm x 7mm thick

CC120  Chrome chalcedony slab

Polished Porphyry . PO 123 Polished slab. OJ129 A rough rockPO123. 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