Centura

Dating to September 1962, Centura Tableware was made through the 1960's and 70's.  From 1977 to 1986 the Centura material also was used to make at least 3 styles of closed handle cups to co-ordinate with Corelle patterns.  The cups can be either white or Sandstone in colour, and like Suprema, Centura also has a layer of glaze which adds lustre and durability. 

Cups, creamer & sugar bowl made of Centura to match Corelle.

In composition, it is a Barium Aluminosilicate glass-ceramic, and when this mineral occurs naturally it is known as Celsian.  Mechanically Centura is incredibly strong and it is also resistant to heat shock, but its one drawback is that it is not microwave safe.  It is quite likely to be the barium that makes it incompatible, and under microwave energy there is a possibility the metallic content can be released into the food. 

But health concerns aside, Centura absorbs microwaves, becoming very hot while diverting energy away from the food.  The result is the dish can be blazing hot and the food merely lukewarm.  This in itself makes Centura an ineffective choice for microwave use.  However this material is completely safe for ordinary usage and can be used in the conventional oven too.

Source:

United States Patent 3,201,266 "Glass Ceramic Bodies and Method of Making Them", John F. MacDowell