Polished fossil Oncolite slab. ONC114 beryl One edge slightly unpolished

One edge slightly unpolished

DO173  Dendritic Opal slab

Dimensions at widest points approximately 90 mm x 75 mm x 8 mm thick

BJ136 Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt)

100% natural

Polished fossil Oncolite slab. ONC114 beryl One edge slightly unpolishedONC114. 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