The light Black Smoker is made out of a spectrum glass. The beautiful agate disk shows an expressional sample, that helped me together with the "black smoked" spectrum glass disk to find the name.
"Black Smokers" are deep water geysers, of which very hot and mineral type water comes out. In this shortly discovered living space, are living organisms that don't breathe oxygen but sulphur.
The link above brings you to an American site which will explain the process more detailed.
Mass of the object height: xxxmm, width: yyy mm, depth: zzz mm
Agate slice xxx mm times yyy mm Breadth: zzz mm