Polished Bauxite BAU131 oldest agate in the world Most between 7 and 10

Most between 7 and 10 mm thick

Magnesite (Lemon chrysoprase) thick slab polished on one side

NJ453   Noreena Jasper slab

Weight 359 grams

GREEN83  Green Opal & Magnesite rough rock

Polished Bauxite BAU131 oldest agate in the world Most between 7 and 10BAU131. Bauxite (laterite) rough rock, cut and polished on one side. Dimensions at widest points approximately 110 mm x 90 mm x 45 mm thick. Weighs 490 grams. Bauxite is the main raw material used in the commercial production of aluminium. Large reserves of this stone occur in Western Australia. This specimen is from east of the Darling Ranges just outside the city of Perth.