Polished fossil Oncolite slab. ONC113 crystoprase Approximate diameter at widest points

Approximate diameter at widest points of sun is 70 mm

chalcedony and magnesite in the one piece

DO196  Dendritic Opal

100 mm x 90 mm x 30 mm thick

BM327  Brecciated  Mookaite rock

Polished fossil Oncolite slab. ONC113 crystoprase Approximate diameter at widest pointsONC113. Fossil Oncolite polished slab. From the Miocene "Trealla Limestone" north of Carnarvon, Western Australia . Age is approx. 15 million years. Dimensions at widest points approx. 165 mm x 160 mm x 9 mm thick. Weighs 449 grams. Oncolite is a limestone composed largely of oncoidsrounded, coated grains that grow as thin layers of lime mud accumulate around a tiny nucleus (such as a sand grain or shell fragment) under microbial influence. Formed in