Polished Marble Bar Chert MB103 chrysoprase From Malbunka copper mine in

From Malbunka copper mine in Northern Territory

Dimensions at widest points approximately 95 mm x 85 mm x 70 mm thick

Dimensions at widest points approximately 125 mm x 115 mm x 35 mm thick

Weighs 345 grams

Polished Marble Bar Chert MB103 chrysoprase From Malbunka copper mine inMB103 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 160 mm x 100 mm x 75 mm thick. Weighs 1,205 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