Corning Incorporated
Black b-spodumene glass ceramics with an optimized color package

Abstract:

A black .beta.-spodumene glass ceramic is provided. The glass ceramic includes .beta.-spodumene as a primary crystal phase and gahnite as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 20.0 to 40.0, a*: -1.0 to 0.5, and b*: -5.0 to 1.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.