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All reasonably uniform in size (roughly 20 -30 mm diameter}
Weighs: 337 grams
OJ173 A slab
Weighs 196 grams
Peanut Wood and Wyloo agate
Polished Porphyry slab. PO 128 dendrites All reasonably uniform in sizePO128. Pink porphyry slab, cut and polished on one side. From Mindoolah, Western Australia. Dimensions at widest points approximately 110 mm x 85 mm x 8. 4 mm thick. Weighs 213 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