Patent ID: 8461068

Claim:
A glass ceramic comprising: a composition comprising, in weight percent; 1.9-2.5% Li 2 O; 18-24% Al 2 O 3 ; 62-82% SiO 2 ; and 1-1.5% SnO 2 ; wherein the glass ceramic is essentially free of TiO 2 , and exhibits diffuse transmission greater than or equal to 20% from 400 nm to 1200 nm; and wherein the glass ceramic is colorless, essentially free of TiO 2 , and exhibits diffuse transmission greater than or equal to 20% from 400 nm to 1200 nm; and wherein the glass ceramic is a bulk crystallized glass ceramic comprising crystals wherein the crystals have an average size from about 100 nm to about 2 μm and an average spacing of about 1 to 5 μm.