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PRR 118.
Dimensions at widest points approximately 160 mm x 80 mm x 65 mm thick.
Weighs 867 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.
