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. 2015 Jan 6;5:7640. doi: 10.1038/srep07640

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Open, half-filled, and solid diamonds: phase I, I+II, and II, respectively, for siderite [FeCO₃] (this study); open and half-filled squares: phase I and I+II, respectively, for magnesite [MgCO₃] (ref. ¹⁰); half-filled triangle: phase I and II for magnesite¹⁶; open and half-filled circles: phase I and I+II, respectively, for (Mg_0.35Fe_0.65)CO₃ (this study); open triangles: phase I for magnesiosiderite [(Mg_0.09Fe_0.82Ca_0.09)CO₃] (ref. ³⁹). Red, black, and blue curves: phase transformation boundary between phase I and II for siderite, magnesiosiderite, and magnesite, respectively. Gray solid curve: expected lower-mantle geotherm⁴¹.