Polished Marble Bar Chert MB118 dup-review-publication The darker pink areas are

The darker pink areas are chalcedony surrounded by lighter coloured opal

Smoky Amethyst crystal from Wyloo

Dimensions approximately 175 mm x 105 mm x 100 mm thick

Convoluted Jasper rough rock

Weighs 855 grams

Polished Marble Bar Chert MB118 dup-review-publication The darker pink areas areMB118 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 120 mm x 60 mm thick. Weighs 2,000 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