In hydrothermal studies of iron oxide-silica-water mixtures at low partial pressures of oxygen the ferrous silicates, fayalite, greenalite and minnesotaite have been synthesized and their stability relations investigated. Equilibrium relationships among phases in the system FeO-Fe 3 O 4 -SiO 2 -H 2 O are discussed in relation to mineral assemblages of Lake Superior iron-formation.

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