Polished Porphyry PO 129 Rough rock CC144 Chrome chalcedony rough rock

CC144  Chrome chalcedony rough rock

From Milgun Station

SD155 Stromatolitic Dolomite rough rock

From the Jeerinah Formation in the Hamersley Ranges

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

Polished Porphyry PO 129 Rough rock CC144 Chrome chalcedony rough rockPO129. 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