Crucible

A crucible is a ceramic or metal container in which metals or other substances may be melted or subjected to very high temperatures. Although crucibles have historically tended to be made out of clay, they can be made from any material that withstands temperatures high enough to melt or otherwise alter its contents.
The form of the crucible has varied through time, with designs reflecting the process for which they are used, as well as regional variation. The earliest crucible... meer