In termstothevitroceramic, only the manufacturing processdiffersboth.A glass-ceramicisaglassmoltensothat therecrystallizedpartially.You should know thatporcelainis not fullycrystallized andcan contain morevitreous phasethatsomeglass.However,its production processis differentas it iscreated bysinteringand notfusionbutif thereduring sinteringof a liquid phasewhich will givethe glassyphase-cooled.All thisis only a matterofname,but theirvery closecompositiongives theglassesand"ceramic" propertiesofveryclosein some aspects.