Metal colloid Colored or colorless glass ceramic and convertible into a metal colloid-colored or colorless glass ceramic colorless glass

Kolioidbildnerhaltiges, clear transparent, convertible into a colorless or colored metal colloid glass ceramic glass comprising (in wt .-% based on oxide): SiO 55.0 to 75.0, preferably 65.0 to 70.0 Al 18.0 to 26.0, preferably 18.0 to 23.0 Li 1.5 to 5.0, preferably 3.4 to 4.2 ZnO 0 to 3.0, preferably 0.8 to 2.5 MgO 0 to 2.5, preferably 0 to 2.0 CaO 0 to 2.5, preferably 0 to 2.0 SrO 0 to 2.5, preferably 0 to 2.0 Na 0 to 1.5, preferably 0 to 0.8 K 0 to 1.5, preferably 0 to 0.8 TiO 0 to 4.0, preferably 0.5 to 3.0 ZrO 0 to 4.0, preferably 0.5 to 2.7 P From 0 to 8.0, preferably 0 to 3, or SiO 35.0 to 65.0, preferably 45.0 to 62.0 Al 15.0 to 40.0, preferably 15.0 to 25.0 MgO 2.0 to 20.0, preferably 2.0 to 10.0 ZnO 0 to 15.0, preferably 2.0 to 15.0 BaO 0 to 10.0, preferably from 0 to 3.0 SrO 0 to 10.0, preferably from 0 to 3.0 TiO 0 to 10.0, preferably 0.5 to 8.0 ZrO 0.5 to 10.0, preferably 0.5 to 4.0 P 0 to 10.0, preferably from 0 to 5.0 B 0 to 10.0, preferably from 0 to ...