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

Dimensions at widest points approximately 140 mm  x 85 mm x 60 mm thick

90 mm x 70 mm x 30 mm thick

300 mm x 205 mm x 50 mm thick

Weighs 575 grams

Dimensions at widest points approximately 130 mm  x 70 mm x 7

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