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CO123 DeGrussa copper ore slab
Weighs 254 grams
BJ140 Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt)
Snakeskin Jasper cut and polished on one side with a cut base to stand as a display specimen
KO105 Killaloe Opal slab
Polished Marble Bar Chert slab MB112 oldest agate in the world CO123 DeGrussa copper ore slabMB112 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