Patent ID: 9236075
Filing Date: 2016-01-12
CPC Classification: C03C,G11B

Claim Text:
1. A crystallized glass containing, as a main crystal phase, one or more selected from RAl 2 O 4 and R 2 TiO 4 (wherein R is one or more selected from Mg and Fe), the crystallized glass comprising, in terms of mass percentage On an oxide basis, SiO Al TiO MgO of 2.5% to 25%, FeO of 0% to 8%, ZnO of 0% to less than 2%, and R′ wherein the value of (Al 2 O 3 +MgO)/SiO 2 is 0.30 or more and 0.65 or less, and a specific gravity is less than 2.63.