Polished fossil Oncolite . ONC118 mookalite BJ123 Polished "Black Jade" A

BJ123  Polished "Black Jade" A trade name for metamorphosed magnesian tholeiite (basalt)

South America

Dimensions at widest points approximately 150 mm x 110 mm x 65 mm thick

A  slab of Chevron Amethyst

RH272  A bulk lot of 12 Rhodonite end cuts

Polished fossil Oncolite . ONC118 mookalite BJ123 Polished "Black Jade" AONC118. 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