Polished Marble Bar Chert MB118 crystoprase form of Pseudogymnosolenid type

form of Pseudogymnosolenid type

OG185   Polished orbicular granite with natural rough back

BL249  Blue Lepidolite display specimen

100 mm x 90 mm x 45 mm thick

120 mm x 55 mm x 45 mm thick

Polished Marble Bar Chert MB118 crystoprase form of Pseudogymnosolenid typeMB118 Marble Bar Chert. Cut and polished on one side with a rough, natural back and a cut base to stand as a display specimen ! Dimensions at widest points approximately 140 mm x 120 mm x 60 mm thick. Weighs 2,000 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