Polished Marble Bar Chert MB119 purple chalcedony Dimensions at widest points approximately

Dimensions at widest points approximately 220 mm x 150 mm x 50 mm thick

Dimensions at widest points approximately 80 mm x 50 mm x 12 mm thick

KO107  Killaloe Opal slab

200 mm x 120 mm  x 13 mm

115 mm x 95 mm x 45 mm thick

Polished Marble Bar Chert MB119 purple chalcedony Dimensions at widest points approximatelyMB119 Marble Bar Chert. Cut and polished on one side with a rough, natural back and a cut base to stand as a display specimen ! Dimensions at widest points approximately 220 mm x 145 mm x 70 mm thick. Weighs 3,919 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