US$ 37.20
U112 Unakite rough rock
PA283 Pilbara Agate
OJ187 A slab
It weighs 565 grams
Weighs 449 grams
Polished fossil Oncolite slab. ONC112 green U112 Unakite rough rockONC112. 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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