Laboratory porcelainware

equipment consisting of a bowl in which substances are ground using a pestle

thumb| A modern crucible used in the production of silicon ingots via the [[Czochralski process|400x400px]] thumb|Smaller clay graphite crucibles for copper alloy melting|300x300px A crucible is a 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.

a piece of laboratory glassware used for the evaporation of solutions and supernatant liquids, and sometimes to their melting point

amount of inorganic noncombustible material a sample contains