·In this paper we determine the temperature dependence of the iron isotope fractionation factors for three minerals belonging to different mineral classes and that therefore involve different interatomic bond energies a sulfide pyrite FeS 2 an oxide hematite Fe 2 O 3 and a carbonate mineral siderite FeCO 3 The computational method based on first
·Sedimentary Fe deposits are both scientifically and economically important As a major ore mineral of these deposits siderite is generally assumed to have been formed via diagenetic transformation of other Fe bearing minerals The Devonian Daxigou sedimentary siderite deposit Central China contains ca 500 Mt Fe with an average ore grade of ca 30
· B Siderite is lenticular and irregular agglomerated in the silty mudstone J 7 C Irregular and banded siderite J 11 D Gelatinous siderite mixed with clay minerals showing angular glauconite Y 3 E Gelatinous siderite is aggregated and pyrite is locally developed J 1 F Microlite siderite aggregate evenly distributed J 5
·These minerals were quartz potassium feldspar sodium feldspar calcite dolomite siderite pyrite kaolinite illite and apatite Each specimen was also analysed by XRD as an as received specimen an 800°C product and a 1600°C product These results allowed evaluation of the applicability of the improved ash fusion test for
·The mechanisms of abiotic sequestration of Se VI and Se IV on a sample of coal waste rock collected from the Elk Valley Canada and on three pure mineral species siderite pyrite and sphalerite present in coal waste rock were assessed using sterile batch testing under water saturated anoxic siderite removed measurable Se VI
·These are pyrite siderite siderite Cu Fe As sulfide Figs 2b 2f siderite goethite and siderite cronstedtite These parageneses are distinguished by the presence of induction boundaries of joint growth of the minerals and the development of some phases along the growth zones of others Quartz is a through mineral of the
Semantic Scholar extracted view of "Pyrite and siderite formation in brackish and freshwater swamp sediments" by D Postma
·Pyrite crystals display a large variability in grain size from <1 μm to ∼50 μm and crystal habit from cubic to octahedral to pentahedral It is impossible to unambiguously identify different crystal generations and their relationships given the too small set of microscopic data and possible modifications of originally precipitated
· Growth relationships between siderite pyrite and calcite within spheres Siderite and Pyrite Elemental mapping of the large pyrite inclusions discussed in Section from the Ashdown Formation confirms the inclusions within the pyrite are mainly siderite with occasional quartz and clays Figure 10 The pyrites are primarily
·Siderite and pyrite are easily oxidized to ferric hydroxides when exposed to O 2 rich groundwater 20 21 However in the MBC samples from both the surface and drill core these minerals
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