Polished Porphyry . PO 118 Chrome chalcedony 115 mm x 50 mm

115 mm x 50 mm x 15 mm thick at widest points

Weight is 380 grams

Tumble polished Chrome Chalcedony

It can be somewhat crumbly when cutting

The quartz epidote axinite mineralisation was evidently caused by hydrothermal activity related to the doleritic sills which are in close proximity to the occurrence

Polished Porphyry . PO 118 Chrome chalcedony 115 mm x 50 mmPO118. Pink porphyry slab, cut and polished on one side. From our mining claim at Mindoolah, Western Australia. Dimensions at widest points approximately 180 mm x 95 mm x 12 mm thick. Weighs 384 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