Polished Marble Bar Chert MB120 rock block Dimensions at widest points approximately

Dimensions at widest points approximately 150 mm x 95 mm x 8 mm  thick

CH443  Chrysoprase  slab polished  on one side

120 mm x 90 mm x 70 mm

The pink and red colouration can be attributed to the presence of finely disseminated iron oxides

Dimensions at widest points approximately 120 mm x 80 mm x 55 mm thick

Polished Marble Bar Chert MB120 rock block Dimensions at widest points approximatelyMB120 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 130 mm x 60 mm x 50 mm thick. Weighs 490 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