Polished Marble Bar Chert MB107 Nickeloan magnesite Dimensions at widest points approximately

Dimensions at widest points approximately 110 mm  x 100 mm wide x 6

Dimensions at widest points approximately 125 mm x 70 mm x 7 mm thick

KO122  Killaloe Opal rough rock

most commonly the green chromiferous muscovite mica

Polished Marble Bar Chert MB107 Nickeloan magnesite Dimensions at widest points approximatelyMB107 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 105 mm x 60 mm x 50 mm thick. Weighs 520 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