Zobrazeno 1 - 10
of 151
pro vyhledávání: '"Roberta Oberti"'
Autor:
Boriana Mihailova, Giancarlo Della Ventura, Naemi Waeselmann, Wei Xu, Jochen Schlüter, Federico Galdenzi, Augusto Marcelli, Günther J. Redhammer, Massimo Boiocchi, Roberta Oberti
Publikováno v:
Communications Materials, Vol 2, Iss 1, Pp 1-10 (2021)
Amphiboles are hydrous silicates occurring in many rock types in the continental crust and subduction zones. Here, in situ Raman spectroscopy of grunerite reveals temperature-activated electron-phonon excitations that provide an atomistic insight int
Externí odkaz:
https://doaj.org/article/b77bc27b819c4cf6b932d96de4f4dd46
Publikováno v:
Minerals, Vol 9, Iss 10, p 591 (2019)
To univocally identify mineral species on the basis of their formula, the IMA-CNMNC recommends the use of the dominant-valency rule and/or the site-total-charge approach, which can be considered two procedures complementary to each other for mineral
Externí odkaz:
https://doaj.org/article/d766f96768f747798055a274ab9658b6
Autor:
Giancarlo Della Ventura, Günther J. Redhammer, Federico Galdenzi, Gennaro Ventruti, Umberto Susta, Roberta Oberti, Francesco Radica, Augusto Marcelli
Publikováno v:
American Mineralogist. 108:59-69
In this work we address the stability of riebeckite at high temperatures and compare the different behaviors observed under various oxidation conditions. For this purpose, we annealed powders of a sample from Mt. Malosa (Malawi), which is composition
Autor:
Yujie Liu, Wenqiang Yang, Chao Zhang, Zhian Bao, Shitou Wu, Renat R. Almeev, Filippo Ridolfi, Roberta Oberti
Publikováno v:
Geostandards and Geoanalytical Research.
Autor:
Frank C. Hawthorne, Maxwell C. Day, Mostafa Fayek, Kees Linthout, Wim. J. Lustenhouwer, Roberta Oberti
Publikováno v:
The American mineralogist 107 (2022): 306–312. doi:10.2138/am-2021-7877
info:cnr-pdr/source/autori:Hawthorne F.C.[1], Day M.C.[1], Fayek M.[1], Linthout K.[2], Lustenhouwer W.J.[2], Oberti R.[3]/titolo:Ferro-papikeite, ideally NaFe2(2+)(Fe3(2+)+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure/doi:10.2138%2Fam-2021-7877/rivista:The American mineralogist/anno:2022/pagina_da:306/pagina_a:312/intervallo_pagine:306–312/volume:107
Hawthorne, F C, Day, M C, Fayek, M, Linthout, K, Lustenhouwer, W J & Oberti, R 2022, ' Ferro-papikeite, ideally NaFe 2 2+ (Fe 3 2+ Al 2 )(Si 5 Al 3 )O 22 (OH) 2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure ', American Mineralogist, vol. 107, no. 2, pp. 306-312 . https://doi.org/10.2138/am-2021-7877
American Mineralogist, 107(2), 306-312. Mineralogical Society of America
info:cnr-pdr/source/autori:Hawthorne F.C.[1], Day M.C.[1], Fayek M.[1], Linthout K.[2], Lustenhouwer W.J.[2], Oberti R.[3]/titolo:Ferro-papikeite, ideally NaFe2(2+)(Fe3(2+)+Al2)(Si5Al3)O22(OH)2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure/doi:10.2138%2Fam-2021-7877/rivista:The American mineralogist/anno:2022/pagina_da:306/pagina_a:312/intervallo_pagine:306–312/volume:107
Hawthorne, F C, Day, M C, Fayek, M, Linthout, K, Lustenhouwer, W J & Oberti, R 2022, ' Ferro-papikeite, ideally NaFe 2 2+ (Fe 3 2+ Al 2 )(Si 5 Al 3 )O 22 (OH) 2, a new orthorhombic amphibole from Nordmark (Western Bergslagen), Sweden: Description and crystal structure ', American Mineralogist, vol. 107, no. 2, pp. 306-312 . https://doi.org/10.2138/am-2021-7877
American Mineralogist, 107(2), 306-312. Mineralogical Society of America
Ferro-papikeite, ideally NaFe22+(Fe32+Al2)(Si5Al3)O22(OH)2, is a new mineral of the amphibole supergroup from the Filipstad Municipality, Värmland County, Central Sweden, where it occurs in a medium-grade felsic metavolcanic rock. Ferro-papikeite is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42fb67f090b0c148aad18f18e7fbcb83
http://www.minsocam.org/msa/ammin/ammineral.html
http://www.minsocam.org/msa/ammin/ammineral.html
Publikováno v:
European journal of mineralogy
31 (2019): 799–806. doi:10.1127/ejm/2019/0031-2858
info:cnr-pdr/source/autori:Oberti, Roberta; Langone, Antonio; Boiocchi, Massimo; Bernabe, Ezio; Hawthorne, Frank C./titolo:News from the hellandite group: the redefinition of mottanaite and ciprianiite and the new mineral description of ferri-mottanaite-(Ce), the first Fe3+-dominant hellandite/doi:10.1127%2Fejm%2F2019%2F0031-2858/rivista:European journal of mineralogy (Print)/anno:2019/pagina_da:799/pagina_a:806/intervallo_pagine:799–806/volume:31
31 (2019): 799–806. doi:10.1127/ejm/2019/0031-2858
info:cnr-pdr/source/autori:Oberti, Roberta; Langone, Antonio; Boiocchi, Massimo; Bernabe, Ezio; Hawthorne, Frank C./titolo:News from the hellandite group: the redefinition of mottanaite and ciprianiite and the new mineral description of ferri-mottanaite-(Ce), the first Fe3+-dominant hellandite/doi:10.1127%2Fejm%2F2019%2F0031-2858/rivista:European journal of mineralogy (Print)/anno:2019/pagina_da:799/pagina_a:806/intervallo_pagine:799–806/volume:31
The ideal formulae of two root-names of the hellandite group, i.e. mottanaite and ciprianiite, were originally given as Ca-X(4)Y(CeCa)(2)(AlBe2)-Al-Z-Be-T[B4Si4O22]O-W(2) and Ca-X(4)Y(Th,U)REE](Sigma 2)Al-Z(T) square(2)[B4Si4O22](W)(OH)(2). In order
Autor:
Giancarlo Della Ventura, Jochen Schlüter, Boriana Mihailova, Roberta Oberti, Thomas Malcherek, N. Waeselmann
Publikováno v:
Journal of Raman spectroscopy 51 (2020): 1530–1548. doi:10.1002/jrs.5626
info:cnr-pdr/source/autori:Waeselmann N.[1], Schluter J.[2], Malcherek T.[1], Della Ventura G.[3], Oberti R.[4], Mihailova B.[1]/titolo:Nondestructive determination of the amphibole crystal-chemical formulae by Raman spectroscopy: One step closer/doi:10.1002%2Fjrs.5626/rivista:Journal of Raman spectroscopy/anno:2020/pagina_da:1530/pagina_a:1548/intervallo_pagine:1530–1548/volume:51
info:cnr-pdr/source/autori:Waeselmann N.[1], Schluter J.[2], Malcherek T.[1], Della Ventura G.[3], Oberti R.[4], Mihailova B.[1]/titolo:Nondestructive determination of the amphibole crystal-chemical formulae by Raman spectroscopy: One step closer/doi:10.1002%2Fjrs.5626/rivista:Journal of Raman spectroscopy/anno:2020/pagina_da:1530/pagina_a:1548/intervallo_pagine:1530–1548/volume:51
We present the results of a comprehensive study linking the crystal-chemical formulae of amphiboles, a series of extremely complex silicates with the general formula (ABCTOW, C = M1M2M3) to variations in the peak positions, widths, and intensities of
Publikováno v:
Mineralogical magazine
82 (2018): 1253–1259. doi:10.1180/minmag.2017.081.093
info:cnr-pdr/source/autori:Oberti, Roberta; Boiocchi, Massimo; Hawthorne, Frank C.; Ciriotti, Marco E./titolo:Magnesio-hornblende from Luderitz, Namibia: mineral description and crystal chemistry/doi:10.1180%2Fminmag.2017.081.093/rivista:Mineralogical magazine (Print)/anno:2018/pagina_da:1253/pagina_a:1259/intervallo_pagine:1253–1259/volume:82
82 (2018): 1253–1259. doi:10.1180/minmag.2017.081.093
info:cnr-pdr/source/autori:Oberti, Roberta; Boiocchi, Massimo; Hawthorne, Frank C.; Ciriotti, Marco E./titolo:Magnesio-hornblende from Luderitz, Namibia: mineral description and crystal chemistry/doi:10.1180%2Fminmag.2017.081.093/rivista:Mineralogical magazine (Print)/anno:2018/pagina_da:1253/pagina_a:1259/intervallo_pagine:1253–1259/volume:82
Magnesio-hornblende (IMA2017-059) has been characterized in a specimen collected in the sand dunes of Lüderitz, Karas Region, Namibia. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement is A(□0.
Autor:
Umberto Susta, Yassir A. Abdu, Boriana Mihailova, Frank C. Hawthorne, Roberta Oberti, Maxwell C. Day, Giancarlo Della Ventura
Publikováno v:
Mineralogical Magazine. 82:837-852
In this work we report on a complete crystal-chemical characterization of a near end-member riebeckite from Malawi, and use the available data to critically compare information obtained from different analytical methods. The sample occurs as well-for
Autor:
Massimo Boiocchi, Roberta Oberti, Olav Revheim, Frank C. Hawthorne, Marco E. Ciriotti, Roberto Bracco
Publikováno v:
Mineralogical magazine
82 (2018): 189–198. doi:10.1180/minmag.2017.081.034
info:cnr-pdr/source/autori:Oberti, Roberia; Boiocci, Massimo; Hawthorne, Frank C.; Ciriotti, Marco E.; Revheim, Olav; Bracco, Roberto/titolo:Clino-suenoite, a newly approved magnesium-iron-manganese amphibole from Valmalenco, Sondrio, Italy/doi:10.1180%2Fminmag.2017.081.034/rivista:Mineralogical magazine (Print)/anno:2018/pagina_da:189/pagina_a:198/intervallo_pagine:189–198/volume:82
82 (2018): 189–198. doi:10.1180/minmag.2017.081.034
info:cnr-pdr/source/autori:Oberti, Roberia; Boiocci, Massimo; Hawthorne, Frank C.; Ciriotti, Marco E.; Revheim, Olav; Bracco, Roberto/titolo:Clino-suenoite, a newly approved magnesium-iron-manganese amphibole from Valmalenco, Sondrio, Italy/doi:10.1180%2Fminmag.2017.081.034/rivista:Mineralogical magazine (Print)/anno:2018/pagina_da:189/pagina_a:198/intervallo_pagine:189–198/volume:82
Clino-suenoite, ideally □${\rm Mn}_{2}^{2 +} $Mg5Si8O22(OH)2 is a new amphibole of the magnesium-iron-manganese subgroup of the amphibole supergroup. The type specimen was found at the Lower Scerscen Glacier, Valmalenco, Sondrio, Italy, where it oc