The oxidation and sulfidation of a particular (Fe, Mg) silicate mineral is most completely represented by means of composition contours on a log f (sub O 2 ) --log f (sub S 2 ) diagram. A part of these phase relations may be expressed in the form of ternary phase diagrams subject to certain stipulated restrictions, e.g., a constant f (sub O 2 ) or the presence of magnetite. It is possible to combine phase diagrams of several (Fe, Mg) silicates in order to display phase relations between these minerals and the iron sulfides in a tetrahedron representing a four-component system. And since sulfur is not a constituent of the silicate minerals, phase relations may be adequately shown on one side of the tetrahedron thus achieving a planar representation.

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