The effect of addition of scheelite, Obtained by both ceramic and coprecipa
tion route, oil the opacity and strength of ceramic glazes are discussed an
d compared with the scheelite obtained by in situ devitrification from addi
tion of WO3. Mohs hardness, Vickers microhardness, gloss and whitness measu
rements of resulting glazes are associated with the obtained microstructure
of glass-ceramic composite.