Polished fossil Oncolite slab. ONC116 Nickeloan magnesite commonly called Western or W

commonly called Western or W

JBJ348  Jelly Bean Jasper or Red Jasper Conglomerate in Hematite rich matrix

150 mm x 80 mm x 16 mm thick and weighs 381 grams

OG209   A matching pair of polished Orbicular Granite halves with natural rough backs

Polished fossil Oncolite slab. ONC116 Nickeloan magnesite commonly called Western or WONC116. 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. 105 mm x 85 mm x 7 mm thick. Weighs 134 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