Patent ID: 8043985

Claim:
Crystallized glass comprising, in terms of percent by mass of oxide: SiO 2 component (as oxides) from 50 to 62%, Al 2 O 3 component (as oxides) from 22 to 26%, at least one of SnO 2 component (as oxide) and CeO 2 component (as oxide), wherein SnO 2 from 0.01 to 5.0% and/or CeO 2 from 0.01 to 5.0% P 2 O 5 component (as oxides) from 5 to 10%, Li 2 O component (as oxide) from 0 to 5%, MgO component (as oxide) from 0 to 4%, ZnO component (as oxide) from 0 to 4%, CaO component (as oxide) from 0.3 to 4%, and BaO component (as oxide) from 0 to 4%, wherein the crystallized glass contains neither of As 2 O 3 component (as oxide) and Sb 2 O 3 component (as oxide).