Polished Marble Bar Chert slab MB129

MB129 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 255 mm x 110 mm x 10 mm thick. Weighs 568 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.