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The porphyry pictured here has pinkish coloured clinozoisite crystals set in a ground mass of dolerite
Dimensions at widest points approximately 100 mm x 45 mm wide x 8 mm thick
Dimensions at widest points approximately 180 mm x 95 mm x 12 mm thick
NJ430 Noreena Jasper Rock Block
4 billion years
Prase rough PRR119 polished magneprase The porphyry pictured here hasPRR 119. Dimensions at widest points approximately 160 mm x 130 mm x 60 mm thick. Weighs 1,739 grams. Prase is a chrome rich chert. The green colour usually derives from minor mineral content, most commonly the green chromiferous muscovite mica, fuchsite. There are numerous Prase deposits in the Pilbara region of Western Australia.
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