1. Li-silicate glass-ceramics comprising a divalent metal oxide selected from MgO, CaO, SrO, BaO, ZnO and mixtures thereof, and comprising at least 12.1 wt.% LiO.2. Glass ceramic according to Claim. 1 except lithium disilicate glass ceramics which comprises at least 6.1 wt.% ZrO.3. Glass ceramic according to Claim. 1 or 2, with the exception of lithium disilicate glass ceramics which comprises at least 8.5 wt.% Transition metal oxide selected from the group consisting of yttrium oxides, transition metal oxides having an atomic number of 41- 79 and mixtures of these oksidov.4. Glass ceramic according to Claim. 1 or 2, which comprises less than 1.0, particularly less than 05 wt.%, And preferably less than 0.1 wt.% KO, and most preferably is substantially free by KO.5. Glass ceramic according to Claim. 1 or 2, which comprises less than 1.0, particularly less than 0.5 and preferably less than 0.1 wt.% KO, NaO takovyh.6 and mixtures thereof. Glass ceramic according to Claim. 1 or 2, which comprises less than 1.0, particularly less than 0.5 and preferably less than 0.1 wt.% Of additional alkali metal oxide, and particularly preferably is substantially free of takovogo.7. Glass ceramic according to Claim. 1 or 2, which comprises less than 0.1 wt.% LaOi is preferably substantially free of takovogo.8. Glass ceramic according to Claim. 1 or 2 which comprises a divalent metal oxide or a mixture thereof in an amount of 0.1-15, particularly 2,0-12,0 and preferably 2.0-8.0 wt.%. 9 . Glass ceramic according to Claim. 1 or n. 2, wherein the divalent metal oxide is SrO.10. Glass ceramic according to Claim. 1 or 2, which contains lithium metasilicate as the main crystalline phase, and in particular, it contains 5 vol% Bole1. Литиево-силикатная стеклокерамика, включающая оксид двухвалентного металла, выбранный из MgO, CaO, SrO, BaO, ZnO и смесей таковых и включающая, по меньшей мере, 12,1 масс.% Li2O.2. Стеклокерамика по п. 1, за исключением литиево-дисиликатной стеклокерамики, котора
