Patent ID: 8507392

Claim:
A LAS-type crystallized glass, which is formed by crystallizing a LAS-type float glass which is substantially free of As 2 O 3 and/or Sb 2 O 3 and precipitates a β-quartz solid solution or a β-spodumene solid solution as a main crystal by heat treatment, wherein, when C 1 [mass %] represents a content of SnO 2 at a glass surface, C 0 [mass %] represents a content of SnO 2 at a depth of 0.5 mm from the glass surface, and k [mass %/mm] represents an SnO 2 concentration gradient defined by k=(C 1 -C 0 )/0.5, the LAS-type float glass satisfies relationships of 0.01≦k≦2 and C 0 ≦0.8 with respect to at least one surface thereof.