Polished fossil Oncolite. ONC110 peanut Under shortwave UV light it

Under shortwave UV light it fluoresces a deep red colour

EU120  Eucryptite rough rock

Dimensions at widest points approximately 90 mm x 75 mm x 9 mm  thick

DOT103  Tumble polished Dendritic Opal

Weighs 657 grams

Polished fossil Oncolite. ONC110 peanut Under shortwave UV light itONC110. 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. 125 mm x 70 mm x 8 mm thick. Weighs 172 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