The innovation enables the reduction of non-recyclable material in rotor blade construction. At the same time, the weight is reduced and the mechanical properties for the stability of wind turbines are increased. For this purpose, glass-fibre reinforced plastic is replaced in the blade components by hard rock as a natural, cost-effective and recyclable lightweight material. The rock slabs, ground to a thickness of a few millimetres, are embedded in a fibre composite laminate with carbon fibres and thus stabilised for changing load cases. The prestressed material is pressure-stable in the composite and can absorb tensile forces in the case of permanent alternating loads without any loss of stiffness.