Polished fossil Oncolite slab. ONC113 Tiger Eye 55 mm x 30 mm

55 mm x 30 mm  x 35 mm

Dimensions at widest points approximately 125 mm x 90 mm x 20 mm thick

CW126   Chinese Writing Stone slab

All reasonably uniform in size (roughly 20 - 30 mm diameter}

Polished fossil Oncolite slab. ONC113 Tiger Eye 55 mm x 30 mmONC113. 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