Iridescent Ammonite - A onyx vase These fossils are found in

These fossils are found in sedimentary rock layers of limestone

These pieces are polished into a mortar and pestle shape

Aventurine is a variety of quartz

These pieces are black and white onyx from Mexico that has been carved and polished into a sea turtle

creating a unique chatoyant effect (a silky

Iridescent Ammonite - A onyx vase These fossils are found inAmmonites were ocean dwelling mollusks that lived from the mid Devonian (388 million years ago) through the Cretaceous (66 million years ago). The iridescence is caused by the unique crystal structure in the layers of aragonite that make up the shell and how it reflects light. This ammonite is from Madagascar of the genus Cleoniceras. You will receive the exact item pictured Dimensions: 3. 5 L X 1 W X 2. 8 H inches Weight: 0. 39 lbs