Polished Porphyry slab. PO 130 Kumarina Agate POP187 Brecciated Pink Opal rough

POP187   Brecciated Pink Opal rough rock

OG149   Polished orbicular granite with natural rough back

DOT101  Tumble polished Dendritic Opal

Dimensions at widest points approximately 150 mm x 80 mm and 6

Polished Porphyry slab. PO 130 Kumarina Agate POP187 Brecciated Pink Opal roughPO130. Pink porphyry slab, cut and polished on one side. From Mindoolah, Western Australia. Dimensions at widest points approximately 270 mm x 150 mm x 8 mm thick. Weighs 711 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