Opaque and colored glass-ceramic containing nepheline crystalline phase

摘要

About 30 mole% to about 65 mole% SiO2, about 15 mole% to about 40 mole% Al2O3, about 10 mole% to about 20 mole% (Na2O + K2O), and at least one nepheline crystalline phase An opaque glass ceramic comprising 1 mol% to about 10 mol% (ZnO + MgO) is disclosed. Also disclosed is an opaque glass ceramic comprising at least one nepheline crystal phase and at least one spinel structural phase doped with at least one colorant selected from transition metals and rare earth elements. Further disclosed are methods for producing these opaque glass ceramics.