An opalescent glass-ceramic product, especially for use as a dental material or as an additive to or component of dental material, including SiO<；SUB>；2<；/SUB>；, Al<；SUB>；2<；/SUB>；O<；SUB>；3<；/SUB>；, P<；SUB>；2<；/SUB>；O<；SUB>；5<；/SUB>；, Na<；SUB>；2<；/SUB>；O, K<；SUB>；2<；/SUB>；O, CaO and Me(IV))O<；SUB>；2<；/SUB>；. In order to obtain improved opalescence with improved transparency, in addition to fluorescence, thermal expansion and a combustion temperature adapted to other materials, the opalescent ceramic product is completely or substantially devoid of ZrO<；SUB>；2 <；/SUB>；and TiO<；SUB>；2<；/SUB>；, such that the Me(II)O content in the glass ceramic is less than approximately 4 wt % and the Me(IV)O<；SUB>；2 <；/SUB>；content amounts to approximately 0.5-3 wt %. The invention also relates to a method for the production of the opalescent glass-ceramic product.
