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Oncolite is a limestone composed largely of oncoids—rounded
Weighs 733 grams
Dimensions at widest points approximately 190 mm x 70 mm x 9 mm thick
MK555 Mookaite
Polished Marble Bar Chert slab MB121 black jasper conglomerate Oncolite is a limestone composedMB121 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