Polished Marble Bar Chert MB128

MB128 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 245 mm x 100 mm x 90 mm thick. Weighs 1,807 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 Earth’s oldest well-preserved sedimentary rocks. From near the town of Marble Bar in Western Australia.