Polished Marble Bar Chert slab MB112 oldest agate in the world Dimensions at widest points approximately

Dimensions at widest points approximately 130 mm x 50  mm x 10

Weighs 254 grams

KO105  Killaloe Opal slab

50 mm x 40 mm x 25 mm

Polished Marble Bar Chert slab MB112 oldest agate in the world Dimensions at widest points approximatelyMB112 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 120 mm x 105 mm x 7 mm thick. Weighs 195 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