Polished Marble Bar Chert slab MB121 black jasper conglomerate Dimensions at widest points approximately

Dimensions at widest points approximately 190 mm  x 70 mm x 9 mm thick

POP205   Brecciated Pink Opal rough rock

Oncolite is a limestone composed largely of oncoids—rounded

Dimensions at widest points approximately 95 mm x 70 mm x 16 mm thick

Weighs 733 grams

Polished Marble Bar Chert slab MB121 black jasper conglomerate Dimensions at widest points approximatelyMB121 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 100 mm x 100 mm x 8 mm thick. Weighs 196 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