NOVELTY - An aluminosilicate glass comprises (in weight%) silica (50-62.5), alumina (16-21), sodium oxide (8 to less than 12), potassium oxide (0 to less than 2), magnesium oxide (0 to less than 1), boron trioxide (0-10), lithium oxide (2-6), zinc oxide (0-8), calcium oxide (0 to less than 1), zirconium oxide (0.1-4), titanium oxide (0-4), cerium oxide (0.01-0.2), fluorine (0-0.5), tin oxide (0.01-0.5), strontium oxide (0-1), phosphorus pentoxide (0.01-8), sulfur trioxide (0-0.05) and iron oxide (0.06-0.12). The aluminosilicate glass has glass transition temperature of 480-590 degrees C.    USE - Aluminosilicate glass is glass prefabricated article for glass article used for manufacturing cover glass used in cell phones, smart phones, tablet personal computer, notebook personal computer, personal digital appliances, television, personal computer, metro-north ticket vending machine, industrial displays, touch screens, cover windows, windows of automobiles, windows of trains, windows of aircrafts, cover glass of touch screens, substrate of hard disks, solar cells, components for white home appliances, and cookers (all claimed).    ADVANTAGE - The glass articles formed using aluminosilicate glass have high hardness, chemical resistance, scratching resistance, impact resistance, and low thermal expansion coefficient.    DETAILED DESCRIPTION - An aluminosilicate glass comprises (in weight%) silica (50-62.5), alumina (16-21), sodium oxide (8 to less than 12), potassium oxide (0 to less than 2), magnesium oxide (0 to less than 1), boron trioxide (0-10), lithium oxide (2-6), zinc oxide (0-8), calcium oxide (0 to less than 1), zirconium oxide (0.1-4), titanium oxide (0-4), cerium oxide (0.01-0.2), fluorine (0-0.5), tin oxide (0.01-0.5), strontium oxide (0-1), phosphorus pentoxide (0.01-8), sulfur trioxide (0-0.05) and iron oxide (0.06-0.12). The aluminosilicate glass has glass transition temperature of 480-590 degrees C, thermal expansion coefficient of 4.5-10x 10-6 K-1 and hardness of 600 Kgf/mm or more. The weight ratio of content of phosphorus pentoxide with respect to lithium oxide in aluminosilicate glass is 0.002-4. The weight ratio of content of phosphorus pentoxide with respect to silica in aluminosilicate glass is 0.0016-0.15. INDEPENDENT CLAIMS are included for the following:    (1) aluminosilicate glass ceramics, which contain glass ceramics containing (in weight%) silica (55-62.5), alumina (17-18), sodium oxide (9 to less than 10), potassium oxide (0-0.8), boron trioxide (0-10), lithium oxide (4-6), zinc oxide (0-5), calcium oxide (0 to less than 1), zirconium oxide (3-4), titanium oxide (0-1), cerium oxide (0.01 to less than 0.2), fluorine (0-0.5), tin oxide (0.01-0.5), strontium oxide (0-1), phosphorus pentoxide (2-6), sulfur trioxide (0-0.05) and iron oxide (0.06-0.12). The weight ratio of content of phosphorus pentoxide with respect to lithium oxide in glass ceramics is 0.17-1.5. The weight ratio of content of phosphorus pentoxide with respect to silica in glass ceramics is 0.017-0.1. The glass ceramics have hardness of more than 700 Kgf/mm2;    (2) chemical tempering method of glass or glass ceramics;    (3) glass prefabricated article; and    (4) glass article.