7 cm x 4.5 cm
Mookaite, also known as Mookaite Jasper, is a silicified porcellanite mineral that can also be fossiliferous (containing fossils within). Its only known locality is in an area known as the Windalia Radiolarite in Western Australia, which is said to have formed during the Cretaceous Period (145-66 million years ago).
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All prices are Australian Dollars.