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OG149 Polished orbicular granite with natural rough back
210 mm x 160 mm x 12 mm thick
From the Cleaverville Formation
DO153 Dendritic Opal rough rock
TI212 Tiger Iron slab
Polished Porphyry . PO 123 Green Opal OG149 Polished orbicular granite withPO123. Pink porphyry slab, cut and polished on one side. From Mindoolah, Western Australia. Dimensions at widest points approximately 140 mm x 80 mm x 8. 5 mm thick. Weighs 188 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
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