Neuschwanstein castle is an iconic building that is one of the most visited tourist spots in Germany. It is located in Swabia, Bavaria, Germ...

This opal fossil is UV fluorescent. The original aragonite internal shell dissolved and was replaced by opal in this belemnite fossil. It e...

The original aragonite internal shell dissolved and was replaced by opal in this belemnite fossil. It existed in the Cretaceous Period. Fos...