The crystallisation kinetics of magnetite from basalt glass was studied using glass samples prepared by melting basaltic rocks from the Serra Geral Formation, without the addition of the nucleating agent, using differential scanning calorimetry under isothermal conditions. The temperature of maximum nucleation rate for magnetite was determined as 650 [Formula: see text]C. Upon further heating to 860 [Formula: see text]C, a second phase crystallises, which was identified by X-ray diffraction as a pyroxene (augite, Ca(Mg,Fe)Si[Formula: see text]O[Formula: see text]). The best mechanical properties were exhibited by a glass-ceramic nucleated at 650 [Formula: see text]C for 0.5 h and further heat-treated at 860 [Formula: see text]C for 1 h. The basalt glass-ceramic exhibited a fine grain and homogeneous microstructure, with high hardness and reasonable resistant to NaOH attack.