“…The main sulfide mineral in these soil materials is pyrite (e.g. Harmsen, 1954;Bloomfield and Coulter, 1973;van Breemen, 1973), but other sulfide minerals such as marcasite Bush et al, 2004a), iron monosulfides (Georgala, 1980;Åström and Åström 1997;Bush and Sullivan, 1997;Bush et al, 2000;Sullivan et al, 2002a;Bush et al, 2004b;Sullivan et al, 2004;Österholm andÅström, 2004: Smith andMelville, 2004) especially mackinawite (Burton et al, 2006a), and elemental sulfur (Burton et al, 2006b) can also be present in appreciable amounts.…”