Polished Porphyry . PO 122 oldest agate in the world Wyloo Agate

Wyloo Agate

Dimensions approx

IRR 132    Fossil stromatolite slab

Dimensions at widest points approximately 105 mm  x 95 mm wide x 6 mm thick

Dimensions at widest points approximately 110 mm  x 100 mm wide x 6

Polished Porphyry . PO 122 oldest agate in the world Wyloo AgatePO122. Pink porphyry slab, cut and polished on one side. From Mindoolah, Western Australia. Dimensions at widest points approximately 290 mm x 165 mm x 10 mm thick. Weighs 898 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