“…Iron biominerals are extracellular or intracellular deposits in a variety of organisms including bacteria (Blakemore, 1975), algae (Torres De Araujo et al, 1985), chitons (Lowenstam, 1962;1967), limpets St Pierre et al, 1986), tunas (Walker et al, 1984), salmons (Kirschvink et al, 1985;Mann et al, 1988), turtles (Perry et al, 1985), human beings (Kirschvink et al, 1992) and rainbow trouts (Diebel et al, 2000). The known iron biominerals are magnetite (Fe3O4), ferrihydrite (5Fe2O3.9H2O), gothite (a-FeOOH), lepidocrocite (c-FeOOH) and amorphous ferric oxides (Mann, 1987).…”