19 Magnetite rich iron formation of Precambrian age Goethite limonite hematite and magnetite are found as important mica polymorphs 3 Extremely disordered expandable low potassium montmorillonite type lattice 4 Mixtures of two or more clay minerals such as kaolinite and illite Characteristic nbsp
water and limonite to be goethite with adsorbed water Maghemite oc curs as an oxidation product of magnetite or as a product of dehydration of lepidocrocite Maghemite is transformed at high temperatures into the the three polymorphic monohydrates is hematite In the present study only hematite and goethite will be nbsp
Hematite Group The iron analogue of Corundum Eskolaite and Karelianite Hematite is rather variable in its appearance it can be in reddish brown ocherous masses dark silvery grey scaled masses silvery grey to black crystals and dark grey masses to name a few What they all have in common is a rust red streak
Points along the nuvariant equilibrium curve siderte hematite magnetite gas SHMG were located ent Other polymorphs of Fe2O3 see Rooksby 1961 were not observed in the present study Graphite the to hematite limonite or goethite and more rarely to magnetite Palache et al 1944 Pettijohn 1957 p 145
This means that chemical weathering transforms the crystals of pyrite into limonite by hydrating the molecules but the external shape of the pyrite crystal remains Limonite pseudomorphs have also been formed from other iron oxides hematite and magnetite from the carbonate siderite and from iron rich silicates such as nbsp
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