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Lightly ground on one side to remove natural surface staining
DO228 Dendritic Opal rough rock
Weighs 510 grams
PU137 Purple Chalcedony slab
Goethite after Marcasite
Polished fossil Oncolite slab. ONC116 fossil stromatolite Lightly ground on one sideONC116. 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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