| http://www.w3.org/ns/prov#value | - Glass-ceramic comprising Al2O3, ZrO2, and a metal oxide other than Al2O3 or ZrO2, wherein at least a portion of the metal oxide other than Al2O3 or ZrO2 is present as at least one distinct crystalline phase, wherein the glass-ceramic comprises at least 50 percent by weight collectively of the Al2O3 and the ZrO2, based on the total weight of the glass-ceramic, wherein the glass-ceramic contains not
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