Polished Marble Bar Chert MB116 #teredo grinding or polishing as the

grinding or polishing as the matrix holding the pisolites (small round pebbles) is in many cases quite soft

130 mm high  x 95 mm x 8

175 mm x 105 mm x 9 mm thick

Dimensions at widest points approximately 110 mm x  80 mm x 30 mm thick

(11" x 16" x 1

Polished Marble Bar Chert MB116 #teredo grinding or polishing as theMB116 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 110 mm x 90 mm x 45 mm thick. Weighs 831 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