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DIVISION S-9—SOIL MINERALOGY

A New Iron Sulfide Precipitated from Saline Solutions

^a Technion-Israel Institute of Technology, Faculty of Agricultural Engineering, IL-32000 Haifa, Israel
^b Dept of Soil and Crop Sciences, College of Agriculture and Life Sciences, Texas A&M University, College Station, TX 77843-2474

^* Corresponding author (j-dixon{at}tamu.edu)

The production of shrimp in ponds is a growing industry and shrimp live in the soil–water interface zone. These and other marine organisms are subject to sulfide toxicity. These investigations were conducted to determine the fate of sulfide (S^2-) in a saline environment like that in which shrimp are grown. A previously unrecognized iron sulfide, which we gave a provisional (unapproved) mineral name, dorite formed during the initial reaction of Fe and S and it may influence sulfide concentration in ponds and transitional marine environments. As the reaction proceeded the 1-nm dorite component converted to mackinawite. We propose a structure for dorite composed of alternating FeS tetrahedral sheets, like mackinawite and defect sheets of the same configuration in which many of the Fe and S atoms are missing preserving electrical neutrality.

Abbreviations: XRD, x-ray diffraction • TEM, transmission electron micrograph. EDS, energy dispersive spectra

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