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- W2334679907 abstract "Alunite in El-Gideda iron mine, Bahria Oasis, occurs as very soft and light white to pinkish beds and pockets ranging in thickness from few cm to 0.5 m intercalated with glauconites of the Hamra Formation. The fine scale mineralogy was determined using XRD, SEM, DTA, TG, IR and XRF. Alunite is the main constituent, and jarosite was detected as a minor mineral. Hydrated halloysite is the main aluminum silicate mineral associated with alunite in varying proportions. Gibbsite and trace of quartz are also detected. Iron oxides are represented by iron-oxyhydroxide (goethite) in size and shape similar to that of bacterial iron mineralization. Amorphous silica was recorded in SEM image and IR spectra. Morphology of alunite ranged from tubular or flatten rhombohedral to well crystallized cubes. This is very characteristic for supergene alunite formed by oxidation of sulfides in a K-rich environment. Due to acid alteration of sulfate, glauconites of the overlying Hamra Formation were altered and released K, Al, Si, and Fe. The former three elements form alunite and halloysite. Iron forms at least a part of the iron ore in the El-Gideda mine. Glauconite intercalated by alunite is highly destabilized with fractured pellets and iron rims as well as low potassium content. Therefore, alunite and halloysite can be considered as by- products of weathering of the intercalated glauconites in an environment of sulfide oxidation (i.e., high Eh, low pH together with biological activities)." @default.
- W2334679907 created "2016-06-24" @default.
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- W2334679907 date "2007-01-01" @default.
- W2334679907 modified "2023-09-26" @default.
- W2334679907 title "Characterization and origin of alunite in the El-Gideda iron mine (Egypt)" @default.
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