Polished Marble Bar Chert slab MB123 magneprase Dimensions at widest points approximately

Dimensions at widest points approximately 130 mm  x 120 mm wide x 11 mm thick

Very unusual piece

Dimensions at widest points approximately 125 mm x 45 mm  x 8

Tapering in thickness from 5mm - 20mm

PC116 Chalcedony/chrysoprase slab

Polished Marble Bar Chert slab MB123 magneprase Dimensions at widest points approximatelyMB123 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 140 mm x 100 mm x 8. 5 mm thick. Weighs 279 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