Prase rough PRR119 polished magneprase The porphyry pictured here has

The porphyry pictured here has pinkish coloured clinozoisite crystals set in a ground mass of dolerite

Dimensions approximately 135mm x 130mm x 9mm thick

Dimensions approximately 140 mm x 120 mm x 8 mm thick

Dimensions at widest points approximately 90 mm x 90 mm x 90 mm thick

Dimensions at widest points approximately 110 mm x 85 mm x 9 mm thick

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.