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BJ118 Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt)
Dimensions at widest points approximately 230 mm x 85 mm x 11
Weighs 479 grams
It weighs 834 grams
Pilbara region
Polished Marble Bar Chert MB107 purple chalcedony BJ118 Polished "Black Jade" AMB107 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 105 mm x 60 mm x 50 mm thick. Weighs 520 grams. Marble Bar chert is a finely banded, iron rich silica rock from the Marble Bar Chert Member (Warrawoona Group) of Western Australia. Formed in shallow Archean seas, it dates to the Paleoarchean (~3. 46 billion years old), making it one of the Earths oldest well preserved sedimentary
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