Polished Porphyry PO 129 Rough rock From Milgun Station

From Milgun Station

The interesting cylindrical cavity on the right hand side is all that remains of a fossil belemnite which was a squid-like creature with a tapering torpedo or bullet shaped body

SD155 Stromatolitic Dolomite rough rock

Each piece approximately  4 - 5

From the Jeerinah Formation in the Hamersley Ranges

Polished Porphyry PO 129 Rough rock From Milgun StationPO129. Pink porphyry rock, cut and polished on one side with a rough, natural back and a cut base to sit as a display specimen. From Mindoolah, Western Australia. Dimensions at widest points approximately 110 mm x 90 mm x 45 mm thick. Weighs 620 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