Reactions forming pyrite and marcasite from solution: I. Nucleation of FeS 2 below 100°C

Details Reactions forming pyrite and marcasite from solution: I. Nucleation of FeS 2 below 100°C Reactions forming pyrite and marcasite from solution: I. Nucleation of FeS 2 below 100°C

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1495s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 6, pp.1495-1504

Physics

21

Scientific paper

Reaction paths for nucleation and growth of pyrite and marcasite from solution have been investigated experimentally. Conditions were chosen to avoid the precipitation of metastable Fe-S phases which can act as precursors for FeS 2 formation. The experiments indicate that FeS 2 nucleation is extremely slow below 100°C. Instead of FeS 2 nuclei, the reaction of ferrous ions and polysulfide ions produces initially amorphous FeS. Although the nucleation of FeS 2 is inhibited below 100°C, pyrite and marcasite can grow from solutions devoid of polysulfides and undersaturated with respect to possible Fe-S precursor phases. The inability of pyrite to rapidly nucleate explains high supersaturation with respect to pyrite and marcasite in anoxic environments. Although pyrite is the stable Fe-S phase in these environments, it will not control the Fe 2+ and H 2 S (or HS - ) concentrations until its growth rate exceeds the dissolution rate of far more soluble, metastable FeS precursor phases.

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