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Journal Articles

Crystal chemistry of Sr-rich piemontite from manganese ore deposit of the Tone mine, Nishisonogi Peninsula, Nagasaki, southwest Japan

Nagashima, Mariko*; Sano, Yuko*; Kochi, Takako*; Akasaka, Masahide*; Sano, Asami

Journal of Mineralogical and Petrological Sciences, 115(5), p.391 - 406, 2020/10

 Times Cited Count:0 Percentile:0.02(Mineralogy)

The crystal chemistry of Sr-rich piemontite from a layered manganese ore deposit of the Tone mine, Nishisonogi Peninsula, Japan, was studied using methods of electron microprobe analysis, single crystal X-ray structural refinement, $$^{57}$$Fe M$"o$ssbauer spectroscopy, and X-ray and Time-of-Flight neutron Rietveld analyses to elucidate the intracrystalline distributions of Sr, Mn and Fe and the general and individual features on the structural changes with Sr contents in piemontite and epidotes.

Journal Articles

Multi-methodical study of the Ti, Fe$$^{2+}$$ and Fe$$^{3+}$$ distribution in chevkinite-subgroup minerals; X-ray diffraction, neutron diffraction, $$^{57}$$Fe M$"o$ssbauer spectroscopy and electron-microprobe analyses

Nagashima, Mariko*; Armbruster, T.*; Akasaka, Masahide*; Sano, Asami; Nishio-Hamane, Daisuke*; Malsy, A.*; Imaoka, Teruyoshi*; Nakashima, Kazuo*

Physics and Chemistry of Minerals, 47(6), p.29_1 - 29_18, 2020/06

 Times Cited Count:3 Percentile:17.75(Materials Science, Multidisciplinary)

Three non-metamict chevkinite-subgroup minerals, from Cape Ashizuri, Japan, Tangir Valley, Diamar District, Pakistan and Haramosh Mts., Skardu district, Pakistan, were studied by crystal chemical techniques. Powder X-ray diffraction and transmission electron microscopic observations confirmed well crystalline samples. Electron-microprobe analyses indicated the general composition known for chevkinite-(Ce). Site scattering values determined by single-crystal X-ray structure refinements suggested assignment of subordinate Nb to the octahedral M3 and M4 sites, minor Th to M1 for the Ashizuri sample and minor Mg to M1 for both samples from Pakistan. Neutron time-of-flight powder diffraction studies were applied to determine the Ti/Fe distribution among octahedral sites for all samples and Mossbauer spectroscopy served for the Fe valence assignment at the four octahedral sites. The dominant iron valence at M1 of the Haramosh sample is ferric whereas for samples Nos. 1 and 2 iron is ferrous.

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