Polished fossil Oncolite slab. ONC114 Marramamba Tiger Eye Weighs 452 grams

Weighs 452 grams

Dimensions approximately 100 mm x 90 mm x 80 mm thick

90 mm x 90 mm x 70 mm

Weighs 615 grams

Dimensions at widest points approximately 250 mm  x 120 mm x 9

Polished fossil Oncolite slab. ONC114 Marramamba Tiger Eye Weighs 452 gramsONC114. 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