21D - Opalized Prehistoric Shell in Concretion

All collectors aspire to have a piece of history within their collections. This Opalized shell dates back approximately 66 to 145 million years ago. The phenomenon of opalization occurs over countless years of geological history. Once a living creature, it has undergone a transformation over time, resulting in these vivid hues of pink, purple, green and blue. Discovered in Montana. 

4.5"x8"x4.5" (inches)

1905g (4.2lbs)

*shell in large matrix