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 having a density of at most 1800 kg/m3;
• 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 mineral filler, and
• at least one thermoplastic binder selected from the group consisting of polyvinyl chloride, polypropylene, and polyethylene terephthalate;
• wherein the ratio of mineral filler to thermoplastic binder 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%.