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U114 Unakite slab
Dimensions at widest points approximately 140 mm x 95 mm x 10 mm
Good example of fault displacement
CH453 Chrysoprase rough rock
Large reserves of this stone occur in Western Australia
Polished fossil Oncolite. ONC109 mookatite U114 Unakite slabONC109. 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 65 mm x 6. 5 mm thick. Weighs 117 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