The invention relates to a millstone arrangement for a flat burr grinder for grinding material to be ground, in particular granular material in the field of foods, consisting of a fixed stator grinding disk and a driven rotor grinding disk, which are arranged one over the other concentrically in such a way that there is a grinding gap, wherein the stator grinding disk has a central opening for feeding the material to be ground and the grinding disks consist of a natural or artificial stone material. According to the invention, the stator grinding disk has a first insert in the region surrounding the opening for feeding material to be ground, which first insert is connected to the grinding disk and is directed toward the center of the opening and toward the grinding gap. Furthermore, the rotor grinding disk has a second insert, which is connected to the rotor grinding disk for conjoint rotation and which has the shape of a cone or a cone frustum in a longitudinal section, wherein the cone tip or cone frustum t
