PROCESS FOR PRODUCTION OF LAS-SYSTEM CRYSTALLINE GLASS

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A process for producing an LAS-system crystalline glass by melting a raw material batch, wherein the LAS-system crystalline glass comprises, in mass%, 55 to 75% of SiO2, 17 to 27% of Al2O3, 3 to 6% of Li2O, 0 to 2% of MgO, 0 to 2% of ZnO, 2 to 5.5% of TiO2, 0 to 3% of ZrO2, 0.03 to 1% of a rare earth oxide, and 0.01 to 0.2% of a halogen and does not substantially contain As2O3 or Sb2O3, and wherein the process is characterized in that the raw material batch contains 0.03 to 1% of the rare earth oxide and 0.05 to 1% of the halogen.