Polished fossil Oncolite slab. ONC112 green U112 Unakite rough rock

U112 Unakite rough rock

cut and polished on one side with a natural weathered back

Weight is 504 grams

PA283  Pilbara Agate

Weight  is 349 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