Polished Marble Bar Chert MB109 rare 145 mm x 145 mm

145 mm x 145 mm  x 9 mm

Dimensions at widest points approximately 225 mm x  120 mm x 10 mm thick

OG209   A matching pair of polished Orbicular Granite halves with natural rough backs

Weighs 680 grams

Polished Marble Bar Chert MB109 rare 145 mm x 145 mmMB109 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 140 mm x 60 mm x 45 mm thick. Weighs 718 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