Iridescent Ammonite - A Snakeskin Agate This piece has been heat-treated

This piece has been heat-treated to form a crystal

The color is attributed to natural radiation that activates color centers around aluminum impurities within the quartz crystal lattice

a member of the silicate group and found in igneous and metamorphic environments

Usually green

and other manganese and iron-based minerals give the stone a mossy appearance

Iridescent Ammonite - A Snakeskin Agate This piece has been heat-treatedAmmonites 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