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C. Upon further heating to 860 
C, a second phase crystallises, which was identified by X-ray diffraction as a pyroxene (augite, Ca(Mg,Fe)Si
O
). The best mechanical properties were exhibited by a glass-ceramic nucleated at 650 
C for 0.5 h and further heat-treated at 860 
C for 1 h. The basalt glass-ceramic exhibited a fine grain and homogeneous microstructure, with high hardness and reasonable resistant to NaOH attack.
/Fe
ratio on the crystallisation of Iron-rich glasses made with industrial wastes
glass by differential thermal analysis
glass