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Dimensions at widest points approximately 90 mm x 80 mm x 13 mm thick
DOT105 Tumble polished Dendritic Opal
130 mm x 70 mm x 8
Box measures 43 cm x 28 cm x 5 cm deep
Polished fossil Oncolite slab. ONC116 Rhodo Dimensions at widest points approximatelyONC116. 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
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