Crystallisation of a glass with the composition 16Na2O·10CaO·49SiO2·25Fe2O3 led to the formation of hematite and magnetite crystals with various morphologies. Crystals containing both the hematite and the magnetite phases were detected and a strict orientation relationship between the phases is described. It is argued that hematite (Fe2O3) is the phase primarily crystallised and magnetite (Fe3O4) is the result of a phase transformation after the primary crystal growth. The main method of characterization was scanning electron microscopy (SEM) combined with electron backscatter diffraction (EBSD).
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Wisniewski et al. (2011) studied this question.
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