Polished Marble Bar Chert slab MB112 axinite DOT104 Tumble polished Dendritic Opal

DOT104  Tumble polished Dendritic Opal

Approximate dimensions at widest points 145 mm  x 75 mm  x 55 mm thick

Dimensions 130 mm x 80 mm x 50 mm thick

Unusual webbing in this piece with small oxidised cubic pyrite inclusions

It weighs 432 grams

Polished Marble Bar Chert slab MB112 axinite DOT104 Tumble polished Dendritic OpalMB112 Marble Bar Chert slab polished on one side . Dimensions at widest points approximately 120 mm x 105 mm x 7 mm thick. Weighs 195 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