Iridescent Ammonite - A Snakeskin Agate Galena can occur with other

Galena can occur with other sulfide minerals

Black Tourmaline

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

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

which was necessary for the manufacture of weapons

Iridescent Ammonite - A Snakeskin Agate Galena can occur with otherAmmonites 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