Polished fossil Oncolite slab. ONC114 Marramamba Tiger Eye Dimensions approximately 100 mm x

Dimensions approximately 100 mm x 90 mm x 80 mm thick

90 mm x 90 mm x 70 mm

Weighs 615 grams

DO179  Dendritic Opal rough rock

Weight is 630 grams

Polished fossil Oncolite slab. ONC114 Marramamba Tiger Eye Dimensions approximately 100 mm xONC114. 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. 150 mm x 100 mm x 7. 5 mm thick. Weighs 241 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