A study of the magnetic properties of glasses with high iron oxide content has been carried out. This glass series was obtained by recycling goethite (FeOOH) industrial waste, with dolomite and glass cullet as complementary raw materials. The magnetisation as a function of applied magnetic field for these glasses was measured. According to the magnetic behaviour, which closely correlates with the iron content, these glasses can be classified as ferrimagnetic, superparamagnetic and paramagnetic. The magnetisation curves were analysed in terms of current models for these types of magnetic behaviour.