Polished Marble Bar Chert slab MB123 polished magneprase Dimensions approximately 200 mm x

Dimensions approximately 200 mm x 155 mm x 10 mm thick

Dimensions at widest points approximately 170 mm x 90 mm x 18 mm thick

POT137  Tumble polished Pink Opal from Mooka Creek

and a cut base to stand as a display specimen

175 mm x 80 mm x 11 mm

Polished Marble Bar Chert slab MB123 polished magneprase Dimensions approximately 200 mm xMB123 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 140 mm x 100 mm x 8. 5 mm thick. Weighs 279 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