TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The aluminosilicate glass composition comprises: 49-69 (preferably 49-58.5) wt.% of SiO2, 0 wt.% of B2O3, greater than 4.7 to 14 (preferably greater than 5 to 14) wt.% of Al2O3, 0-4 (preferably 0 to less than 0.3) wt.% of Li2O, greater than 10 to 18 wt.% of Na2O, greater than 0 to 8 (preferably greater than 0 to less than 4) wt.% of K2O, where the sum of Li2O+Na2O+K2O is greater than 10 to 19 wt.%, 0-5 wt.% of MgO, 7 to less than 12 wt.% of CaO, 0-5 (preferably 0 to less than 0.5) wt.% of SrO, 0-10 (preferably greater than 1 to less than 3.5) wt.% of BaO, where the MgO+CaO+SrO+BaO is 7-19 wt.%, 0-3 wt.% of F, 0-5 (preferably greater than 0.5 to 5) wt.% of TiO2, 0-0.5 wt.% of Fe2O3, greater than 1 to 9 wt.% of ZrO2 and 0-3 wt.% of CeO2, WO3, Bi2O3 and MoO3; or 49-66 (preferably 49-58.5) wt.% of SiO2, greater than 4.7 to 14 (preferably greater than 5 to 14) wt.% of Al2O3, greater than 11 to 18 wt.% of Na2O, greater than 0.5 to 8 (preferably greater than 0 to less than 4) wt.% of K2O, where the sum of Na2O+K2O is greater than 11 to 19 wt.%, 0.1-3 wt.% of MgO, 7 to less than 12 wt.% of CaO, greater than 1 to 9 (preferably 1.5 to less than 3.5) wt.% of BaO, where the MgO+CaO+BaO is 8.2-19 wt.%, 0-3 wt.% of F, 0-5 (preferably greater than 0.5 to 5) wt.% of TiO2, 0-0.5 wt.% of Fe2O3, greater than 1 to 9 wt.% of ZrO2 and 0-3 wt.% of CeO2, WO3, Bi2O3 and MoO3, where the glass contains no B2O3, Li2O and SrO. Preferred Components: The sum of MgO+CaO+ZrO2 is 10-20 (preferably 14 to less than 19) wt.%. The glass does not contain B2O3, Li2O and SrO up to unavoidable impurities. The aluminosilicate glass comprises conventional refining agents such as sulfate, chloride, antimony trioxide, arsenic trioxide and tin dioxide. EXAMPLE - Typical aluminosilicate glass composition comprised (in wt.%) of: silicon dioxide (58.45); aluminum oxide (10.20); sodium oxide (11.50); potassium oxide (4.48); magnesium oxide (0.02); calcium oxide (8.50); barium oxide (1.50); and zirconium oxide (5.35), where the glass transition temperature was 590 degrees C and processing temperature was 1090 degrees C.