Synthetic Mg–Fe–Ni olivines annealed at 1000°C have been studied. The site populations of Fe2+, Mg2+ and Ni2+ among the M1 and M2 sites have been determined by a combination of Mössbauer spectroscopy and the profile-fitting technique based on X-ray powder diffraction data. The Mg2+–Fe2+ cation distribution coefficient, KD = [XFe(M1) · XMg(M2)]/[XFe(M2) · XMg(M1)], is close to unity but slightly decreases with increasing nickel content. The Ni2+–(Mg2+ + Fe2+) cation distribution is close to that of Ni2+–Mg2+ earlier reported for some synthetic Ni–Mg olivines.

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First page of The cation distribution in synthetic Mg–Fe–Ni olivines
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