White glass-ceramic articles with opacity and high fracture toughness, and methods of making the same

A glass-ceramic article, comprising (in mol %):

• 70-72% SiO2;
• 3.5-4.5% Al2O3;
• 0.5-1.5% P2O5;
• 20-24% Li2O;
• 0-0.5% Na2O;
• 0-0.5% K2O;
• 1.7-2.3% ZrO2;
• 0-0.5% CaO;
• 0-0.2% Fe2O3;
• 0-0.2% HfO2;
• and
• 0.001-0.2% SnO2,
• wherein the glass-ceramic article is opaque,
• wherein the glass-ceramic article comprises a β-spodumene solid solution crystalline phase, a lithium disilicate crystalline phase, and one or more ZrO2-containing crystalline phases, and
• further wherein the glass-ceramic article is derived from a glass precursor having a β-OH content from 0.1/mm to 0.5/mm.

A glass-ceramic article, comprising (in mol %):

• 67-74% SiO2;
• 2-6% Al2O3;
• 0.5-1.5% P2O5;
• 18-25% Li2O;
• 0-1% Na2O;
• 0-1% K2O;
• 1-4% ZrO2;
• 0-2% CaO;
• and
• 0.001-0.5% SnO2,
• wherein the glass-ceramic article is opaque, and
• further wherein the glass-ceramic article comprises a lithium disilicate crystalline phase, a β-spodumene solid solution crystalline phase, a Zr-based crystalline phase, and a lithium phosphate crystalline phase.