Polished fossil Oncolite slab. ONC114 dendrites 80 mm x 65 mm

80 mm x 65 mm x 45 mm

Weight is 309 grams

It weighs 476 grams

From the Greenbushes mine in southern Western Australia which is the largest operating lithium mine in the world

Polished fossil Oncolite slab. ONC114 dendrites 80 mm x 65 mmONC114. 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