Patent ID: 8309480

Claim:
Crystallized glass obtained by subjecting crystallizable glass to heat treatment to crystallize the crystallizable glass; wherein the crystallizable glass substantially contains neither As 2 O 3 nor Sb 2 O 3 and has a composition of, in percent by mass, 55.0 to 73.0% SiO 2 , 17.0 to 27.0% Al 2 O 3 , 2.0 to 5.0% Li 2 O, 0 to 1.5% MgO, 0 to 1.5% ZnO, 0 to 1.0% Na 2 O, 0 to 1.0% K 2 O, 0 to 3.8% TiO 2 , 0 to 2.5% ZrO 2 , 0.1 to 0.6% SnO 2 , and 2.3 to 3.8% TiO 2 +ZrO 2 .