Polished Marble Bar Chert MB109 oldest agate in the world Tumble polished Chrysoprase

Tumble polished Chrysoprase

300 mm x 120 mm  x 11 mm

and a cut base to stand as a display specimen

Dimensions at widest points approximately 200 mm x 120 mm x 75 mm thick

Polished Marble Bar Chert MB109 oldest agate in the world Tumble polished ChrysopraseMB109 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