Polished fossil Oncolite slab. ONC117 chrysoprase Dimensions approximately 130 mm x

Dimensions approximately 130 mm x 100 mm x 50 mm thick

Polished petrified wood slab

115 mm x 60 mm x 40 mm thick

TI284   Tiger Iron slab

Eucryptite is a lithium aluminium silicate that occurs in LCT pegmatites

Polished fossil Oncolite slab. ONC117 chrysoprase Dimensions approximately 130 mm xONC117. 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. 160 mm x 80 mm x 8. 5 mm thick. Weighs 217 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