US$ 19.50
OJ187 A slab
It weighs 565 grams
OG201 Polished orbicular granite slab
U112 Unakite rough rock
Polished fossil Oncolite slab. ONC112 green OJ187 A slabONC112. 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. 145 mm x 105 mm x 8 mm thick. Weighs 285 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
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