Polished fossil Oncolite . ONC118 mookalite Dimensions at widest points approximately

Dimensions at widest points approximately 170 mm x 130 mm x 80 mm thick

South America

A  slab of Chevron Amethyst

Dimensions approximately 110 mm x 75 mm x 55 mm deep

Polished fossil Oncolite . ONC118 mookalite Dimensions at widest points approximatelyONC118. Fossil Oncolite rough rock, cut and polished on one side with a natural, weathered back. Sits well as a display specimen ! From the Miocene "Trealla Limestone" north of Carnarvon, Western Australia . Age is approx. 15 million years. Dimensions at widest points approx. 195 mm x 95 mm x 50 mm thick. Weighs 1,482 grams. Oncolite is a limestone composed largely of oncoidsrounded, coated grains that grow as thin layers of lime mud accumulate around