Polished Marble Bar Chert MB115 ashburton agate Dimensions at widest points approximately

Dimensions at widest points approximately 230 mm  x 100 mm x 10 mm thick

OG212   Polished orbicular granite with natural rough back

Tiger iron is a banded iron formation (BIF) or jaspilite that has alternating layers of black and brown hematite/magnetite

NJ471  Noreena Jasper slab

Dimensions at widest point approximately 150 mm x 100 mm x 8

Polished Marble Bar Chert MB115 ashburton agate Dimensions at widest points approximatelyMB115 Marble Bar Chert. Cut and polished on one side with a rough, natural back. Dimensions at widest points approximately 150 mm x 110 mm x 50 mm thick. Weighs 1,151 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