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First natural hexaferrite with mixed β'''-ferrite (β-alumina) and magnetoplumbite structure from Jabel Harmun, Palestinian Autonomy

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Ferrites of K and Ba close in composition to the known synthetic compounds KFe2+ 2Fe3+ 15 O25and BaMg2Fe3+ 16O27were found in a thin vein,filled with magnesioferrite and khesinite, in pyrometamorphic flamite–gehlenite hornfels of the Hatrurim Complex, Palestinian Autonomy. Both ferrites are characterized by a modular structure composed of 5-layered spinel (S) blocks interstratified with R-blocks. The R -modules of K-ferrite are of the β-alumina type whereas those in Ba-ferrite are of the magnetoplumbite type. Rare grains of K-Ba-ferrite of intermediate composition with the empirical crystal chemical formula (EPMA) (K0.57 Ba0.38 Na0.05)σ1 (Fe3+ 14.08 Mg1.42Al0.80 Zn0.59Ni0.16Ca0.14Cu0.09Mn0.03Ti0.03Si 0.02)σ17.36 O25.54, were also discovered. The structure of the natural mixed potassium-barium ferrite was investigated by single-crystal X-ray diffraction. The hexagonal space-group symmetry (P6 m 2,Z = 2) with a = 5.9137(2) and c = 33.1450(15) A is different to that (P 63/mmc) of the end-members and yields alternate stacking of β-alumina type KMg2 Fe15 O25 and magnetoplumbite type BaMg2 Fe16 O27 "supermodules", each extending ½ of the unit cell along c. Raman spectroscopic study confirms the mixed character of K-Ba-ferrite structure. K-Baferrite formed at non-equilibrium conditions and may be interpreted as an example of a nano-dissipative structure.
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Keywords: COMPLEX; HATRURIM; MAGNETOPLUMBITE; MIXED STRUCTURE; POTASSIUM AND BARIUM FERRITE; PYROMETAMORPHIC ROCK; RAMAN; β-ALUMINA

Document Type: Research Article

Publication date: June 1, 2018

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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