Decorative panel and method for producing a panel

A floor or wall panel comprising:

• a substantially planar top side, a substantially planar bottom side, and at least four substantially linear side edges comprising at least one pair of opposite side edges;
• wherein the panel has a layered structure which comprises:
• at least one extruded and at least partially foamed core layer;
• and
• at least one decorative top layer;
• wherein the at least one extruded and at least partially foamed core layer comprises at least one composite material, said composite material comprising:
• at least one filler, wherein the at least one filler is a mineral filler;
• and
• at least one binder, wherein the at least one binder is a thermoplastic material;
• wherein the composite material comprises the at least one filler in an amount greater than or equal to 30 wt. % and the at least one binder in an amount less than or equal to 40 wt. %, and the ratio of mineral filler to thermoplastic material in the composite material is at least 3:1;
• and
• wherein the at least one extruded and at least partially foamed core layer has an average density variation, said average density variation across a lateral width of the at least one extruded and at least partially foamed core layer is within 10%.