957 resultados para Mn:YAP
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[Isaak aus Tyrnau]
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Digitalisat der Ausg. Ofenbach, [i.e. circa 1810]
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Digitalisat der Ausg. Ofenbach, [1811/12]
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Digitalisat der Ausg. Rödelheim, 1800
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[Isaak Ben-Salomon Ibn-Abi-Sahula]
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Digitalisat der Ausg. Fjurda, [1778/79]
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der meḥaber izṭ gwezn ... Seril bas ... Jaakov mi-Dubno ... oif loišn ha-koideš und ṭaiṭš
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[Eliezer Liebermann Sofer Ben-Jehuda Loeb]
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[Isaak aus Tyrnau]
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Digitalisat der Ausg. [S.l.], [circa 1750]
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[Elchanan Haendel Kirchhahn]
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Digitalisat der Ausg. Frankfurṭ, [1708/09]
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Digitalisat der Ausg. Sulzbach, 1837
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Reinvestigation of more than 40 samples of minerals belonging to the wagnerite group (Mg, Fe, Mn)2(PO4)(F,OH) from diverse geological environments worldwide, using single-crystal X-ray diffraction analysis, showed that most crystals have incommensurate structures and, as such, are not adequately described with known polytype models (2b), (3b), (5b), (7b) and (9b). Therefore, we present here a unified superspace model for the structural description of periodically and aperiodically modulated wagnerite with the (3+1)-dimensional superspace group C2/c(0[beta]0)s0 based on the average triplite structure with cell parameters a [asymptotically equal to] 12.8, b [asymptotically equal to] 6.4, c [asymptotically equal to] 9.6 Å, [beta] [asymptotically equal to] 117° and the modulation vectors q = [beta]b*. The superspace approach provides a way of simple modelling of the positional and occupational modulation of Mg/Fe and F/OH in wagnerite. This allows direct comparison of crystal properties.