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- W2303837820 abstract "This study of a pyrrhotite-dominated massive sulfide deposit in the Blue Ridge province in southwestern Virginia shows that sulfate minerals formed by the oxidation of the pyrrhotite transform from one to another by a combination of oxidation, dehydration, and neutralization reactions. Significant quantities of sulfate minerals occur in the underground adits (Area I) and under overhangs along the high sidewall of the adjoining open pit (Area II). Samples from this site were analyzed to determine mineralogy, equilibrium relative humidity, chemical composition, and acid generation potential. In Area I, pyrrhotite oxidizes to marcasite + melanterite, which eventually oxidizes to melanterite + sulfuric acid. Melanterite is extruded from the rocks as a result of the volume change associated with this reaction. It accumulates in piles where halotrichite, copiapite, and fibroferrite form. In Area II, FeSO4 solutions produced by pyrrhotite oxidation migrate to the exposed pit face, where they evaporate to form melanterite. The melanterite rapidly dehydrates to form rozenite, which falls into a pile at the base of the wall, where melanterite, copiapite, and halotrichite are present. The observed paragenesis can be understood using a log αO₂ - log αH₂O diagram that we developed from published thermodynamic data and observations of coexisting phases." @default.
- W2303837820 created "2016-06-24" @default.
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- W2303837820 date "2003-11-01" @default.
- W2303837820 modified "2023-10-02" @default.
- W2303837820 title "Efflorescent iron sulfate minerals: Paragenesis, relative stability, and environmental impact" @default.
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- W2303837820 doi "https://doi.org/10.2138/am-2003-11-1235" @default.
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