Polished Porphyry slab. PO 130 Rhodonite Very unusual piece

Very unusual piece

GRN103  Green Opal & Magnesite rough rock

from the Proterozoic "Duck Creek Dolomite"

Dimensions at widest points approximately 120 mm  x 55 mm wide x 8 mm thick

Polished Porphyry slab. PO 130 Rhodonite Very unusual piecePO130. 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