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Figure 11
Proportions of Sn4+ and Sn2+ in Na2O.2SiO2 glass (Johnston, 1965BB25) as a function of oxygen fugacity (fO2) and temperature [equation (66)[link]]. Several oxygen buffers are shown; NNO = Ni–NiO, FMQ = fayalite–magnetite–quartz, IW = iron–wüstite. Most terrestrial igneous rocks have oxygen fugacities within ±2 Log-units of the FMQ buffer, where Sn4+ and Sn2+ could co-exist.

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