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Abstract

A glass-ceramic of the lithium aluminosilicate type includes a solid solution of β-spodumene and exhibits, for a thickness of 4 mm; a light transmittance within a range extending from 0.3 to 2%, an optical transmittance for a wavelength of 625 nm of greater than 3.0%, an optical transmittance for a wavelength of 950 nm within a range extending from 50 to 75%, an optical transmittance for a wavelength of 1600 nm of at least 50%, and L*, a*, b* colorimetric coordinates in diffuse reflection for an illuminant D65 and a reference observer at 2° such that 15.0≦L*≦40.0, −3.0≦a*≦3.0 and −10.0≦b*≦3.0. The chemical composition of the glass-ceramic includes the following constituents, varying within the limits by weight defined: SnO₂ 0.2-0.6%, V₂O₅ 0.015-0.070%, Cr₂O₃0.01-0.04% or Bi₂O₃ 0.05-3.0%, Fe₂O₃ 0.05-<0.15%, AS₂O₃+Sb₂O₃<0.1%.

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First Claim