Polished Marble Bar Chert slab MB122 Polished dendritic opal Dimensions at widest points approximately

Dimensions at widest points approximately 90 mm x 65 mm x  10 mm thick

Dimensions at widest points approximately 60 mm x 60 mm x 25 mm thick

Weighs 575 grams

300 mm x 205 mm x 50 mm thick

Weighs:  208 grams

Polished Marble Bar Chert slab MB122 Polished dendritic opal Dimensions at widest points approximatelyMB122 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 120 mm x 100 mm x 9. 5 mm thick. Weighs 273 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