Definition of Ceramic

A recent post to an email group called "Naked Raku"
******
I recieved this definition while touring the Ceramic Color & Chemical MFG.Co in New Brighton, PA, July'04

"Minerals of variable compostion and rather doubtful purity are subjected to an unmeasurable thermal treatment for a period of time just enough to allow unknown reaction to take place incompletely, yielding the heterogenous, nonstoichiometric material known by the name ceramic."

Unfortunately, the person did not sign the name.