Polished fossil Oncolite slab. ONC116 fossil stromatolite POP178 Pink Opal slab

POP178   Pink Opal slab

20 large tumble polished Mookaite palm stones

145 mm x 105 mm x 8 mm thick

Weighs 539 grams

Goethite after Marcasite

Polished fossil Oncolite slab. ONC116 fossil stromatolite POP178 Pink Opal slabONC116. 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