the invention is explained in more detail below with the following examples the sample preparation and its elemental oxide composition are listed in table 1 a particularly preferred lithium silicate material as described in the examples 1 to 10 comprises 53 to 59 wt of sio 2 14 to 19 wt of li 2 o and 1 to 9 of geo 2 where after nucleation only lithium silicate is formed and then after complete crystal growth only lithium silicate crystals are formed the lithium silicate material of this invention is preferably produced by a process which comprises the following steps a a mix of the precursors of the final components of the table 1 are blended together for 10 to 30 min until a mechanical mix is obtained b the mix is ball milled dry or wet using zirconia media for about 1 to 2 hours to homogenize the components and achieve almost the same particle size in all the components c the sample is calcined at 800 u00b0 c for about 1 to 4 hours in order to decompose the precursors to their primary oxides and eliminate any possibility of formation of gas after the process d ball mill the sample.