Polished Marble Bar Chert MB115 polished jasper Dimensions approximately 220mm x 115mm

Dimensions approximately 220mm x 115mm x 4-10mm thick

NJ462  A rough rock

OG186   Polished orbicular granite with natural rough back

CO122  DeGrussa copper ore slab

Dimensions at widest points approximately 375 mm x 240 mm x 15

Polished Marble Bar Chert MB115 polished jasper Dimensions approximately 220mm x 115mmMB115 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 150 mm x 110 mm x 50 mm thick. Weighs 1,151 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