Polished Marble Bar Chert MB104 Opalite OPS112 Opalised Serpentine rough rock

OPS112  Opalised Serpentine rough rock

Dimensions at widest points approximately 190 mm x 130 mm x 30 mm thick

tumbling or specimens

60 mm x 35 mm  x 30 mm

Polished Marble Bar Chert MB104 Opalite OPS112 Opalised Serpentine rough rockMB104 Marble Bar Chert. Cut and polished on one side with a rough, natural back and a cut base to stand as a display specimen ! Dimensions at widest points approximately 140 mm x 70 mm x 40 mm thick. Weighs 850 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