Polished Marble Bar Chert slab MB130 Chrome chalcedony Dimensions at widest points approximately

Dimensions at widest points approximately 140 mm x 100 mm x 50 mm thick

150 mm x 150 mm  x 14 mm thick

Dimensions at widest points approximately 180 mm  x 110 mm x 9 mm thick

120 mm x 100 mm x 25 mm thick

Weighs 681 grams

Polished Marble Bar Chert slab MB130 Chrome chalcedony Dimensions at widest points approximatelyMB130 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 200 mm x 120 mm x 9 mm thick. Weighs 406 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 rocks. From near the town of