Corning Incorporated
Black beta-spodumene lithium silicate glass ceramics

Abstract:

A black .beta.-spodumene lithium disilicate glass ceramic is provided. The glass ceramic includes at least one of magnetite, .beta.-quartz, cristobalite, and lithium phosphate as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 15.0 to 35.0, a*: -3.0 to 3.0, and b*: -5.0 to 5.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.