Polished Marble Bar Chert slab MB114 Opalite Weighs 689 grams

Weighs 689 grams

Dimensions at widest points approximately 200 mm  x 105 mm x 9 mm thick

An unusual feature of some pieces are septarian structures with black colouration

Dimensions at widest points approximately 310 mm x 220 mm  x 9 mm thick

Dimensions at widest points approximately 110 mm x 100 mm x 15 mm thick

Polished Marble Bar Chert slab MB114 Opalite Weighs 689 gramsMB114 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 140 mm x 90 mm x 9 mm thick. Weighs 188 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