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Journal Article

Oxidation or cation re-arrangement? Distinct behavior of riebeckite at high temperature

Giancarlo Della Ventura, Günther J. Redhammer, Federico Galdenzi, Gennaro Ventruti, Umberto Susta, Roberta Oberti, Francesco Radica, Augusto Marcelli
Published: 03 January 2023
American Mineralogist (2023) 108 (1): 59–69.
DOI: https://doi.org/10.2138/am-2022-8073
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Ferro-papikeite, ideally Na F e 2 2 + ( F e 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

Frank C. Hawthorne, Maxwell C. Day, Mostafa Fayek, Kees Linthout, Wim. J. Lustenhouwer, Roberta Oberti
Published: 01 February 2022
American Mineralogist (2022) 107 (2): 306–312.
DOI: https://doi.org/10.2138/am-2021-7877
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Thermoelasticity, cation exchange, and deprotonation in Fe-rich holmquistite: Toward a crystal-chemical model for the high-temperature behavior of orthorhombic amphiboles

Roberta Oberti, Massimo Boiocchi, Michele Zema
Published: 01 December 2019
American Mineralogist (2019) 104 (12): 1829–1839.
DOI: https://doi.org/10.2138/am-2019-6966
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The dynamics of Fe oxidation in riebeckite: A model for amphiboles

Giancarlo Della Ventura, Boriana Mihailova, Umberto Susta, Mariangela Cestelli Guidi, Augusto Marcelli, Jochen Schlüter, Roberta Oberti
Published: 01 July 2018
American Mineralogist (2018) 103 (7): 1103–1111.
DOI: https://doi.org/10.2138/am-2018-6382
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AMFORM, a new mass-based model for the calculation of the unit formula of amphiboles from electron microprobe analyses

Filippo Ridolfi, Alberto Zanetti, Alberto Renzulli, Diego Perugini, Francois Holtz, Roberta Oberti
Published: 01 July 2018
American Mineralogist (2018) 103 (7): 1112–1125.
DOI: https://doi.org/10.2138/am-2018-6385
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Deprotonation of Fe-dominant amphiboles: Single-crystal HT-FTIR spectroscopic studies of synthetic potassic-ferro-richterite

Giancarlo Della Ventura, Umberto Susta, Fabio Bellatreccia, Augusto Marcelli, Günther J. Redhammer, Roberta Oberti
Published: 01 January 2017
American Mineralogist (2017) 102 (1): 117–125.
DOI: https://doi.org/10.2138/am-2017-5859
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Use of multivariate analysis for synchrotron micro-XANES analysis of iron valence state in amphiboles

M. Darby Dyar, Elly A. Breves, Mickey E. Gunter, Antonio Lanzirotti, Jonathan M. Tucker, C.J. Carey, Samantha E. Peel, Elizabeth B. Brown, Roberta Oberti, Mirna Lerotic, Jeremy S. Delaney
Published: 01 May 2016
American Mineralogist (2016) 101 (5): 1171–1189.
DOI: https://doi.org/10.2138/am-2016-5556
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Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar—crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite

Roberta Oberti, Massimo Boiocchi, Frank C. Hawthorne, Neil A. Ball, George E. Harlow
Published: 01 April 2015
American Mineralogist (2015) 100 (4): 909–914.
DOI: https://doi.org/10.2138/am-2015-5132
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Synthesis and characterization of amphiboles along the tremolite–glaucophane join

David M. Jenkins, Giancarlo Della Ventura, Roberta Oberti, Krassimir Bozhilov
Published: 01 April 2013
American Mineralogist (2013) 98 (4): 588–600.
DOI: https://doi.org/10.2138/am.2013.4281
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Nomenclature of the amphibole supergroup

Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacher, Mark D. Welch
Published: 01 November 2012
American Mineralogist (2012) 97 (11-12): 2031–2048.
DOI: https://doi.org/10.2138/am.2012.4276
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The crystal chemistry of Li in gadolinite

Fernando Cámara, Roberta Oberti, Luisa Ottolini, Giancarlo Della Ventura, Fabio Bellatreccia
Published: 01 July 2008
American Mineralogist (2008) 93 (7): 996–1004.
DOI: https://doi.org/10.2138/am.2008.2748
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Magnesium K -edge EXAFS study of bond-length behavior in synthetic pyrope-grossular garnet solid solutions

Simona Quartieri, Federico Boscherini, Chiara Dalconi, Gianluca Iezzi, Carlo Meneghini, Roberta Oberti
Published: 01 February 2008
American Mineralogist (2008) 93 (2-3): 495–498.
DOI: https://doi.org/10.2138/am.2008.2831
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Scandium-45 NMR of pyrope-grossular garnets: Resolution of multiple scandium sites and comparison with X-ray diffraction and X-ray absorption spectroscopy

Namjun Kim, Jonathan F. Stebbins, Simona Quartieri, Roberta Oberti
Published: 01 November 2007
American Mineralogist (2007) 92 (11-12): 1875–1880.
DOI: https://doi.org/10.2138/am.2007.2601
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FTIR spectroscopy of Ti-rich pargasites from Lherz and the detection of O 2− at the anionic O3 site in amphiboles

Giancarlo Della Ventura, Roberta Oberti, Frank C. Hawthorne, Fabio Bellatreccia
Published: 01 October 2007
American Mineralogist (2007) 92 (10): 1645–1651.
DOI: https://doi.org/10.2138/am.2007.2199
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Aluminotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry

Roberta Oberti, Massimo Boiocchi, David C. Smith, Olaf Medenbach
Published: 01 August 2007
American Mineralogist (2007) 92 (8-9): 1428–1435.
DOI: https://doi.org/10.2138/am.2007.2529
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Site preference and local geometry of Sc in garnets: Part I. Multifarious mechanisms in the pyrope-grossular join

Roberta Oberti, Simona Quartieri, Maria Chiara Dalconi, Federico Boscherini, Gianluca Iezzi, Massimo Boiocchi, Sigrid Griet Eeckhout
Published: 01 August 2006
American Mineralogist (2006) 91 (8-9): 1230–1239.
DOI: https://doi.org/10.2138/am.2006.2037
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Site preference and local geometry of Sc in garnets: Part II. The crystal-chemistry of octahedral Sc in the andradite–Ca 3 Sc 2 Si 3 O 12 join

Simona Quartieri, Roberta Oberti, Massimo Boiocchi, Maria Chiara Dalconi, Federico Boscherini, Olga Safonova, Alan B. Woodland
Published: 01 August 2006
American Mineralogist (2006) 91 (8-9): 1240–1248.
DOI: https://doi.org/10.2138/am.2006.2038
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The arrojadite enigma: I. A new formula and a new model for the arrojadite structure

Fernando Cámara, Roberta Oberti, Christian Chopin, Olaf Medenbach
Published: 01 August 2006
American Mineralogist (2006) 91 (8-9): 1249–1259.
DOI: https://doi.org/10.2138/am.2006.2189
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The arrojadite enigma: II. Compositional space, new members, and nomenclature of the group

Christian Chopin, Roberta Oberti, Fernando Cámara
Published: 01 August 2006
American Mineralogist (2006) 91 (8-9): 1260–1270.
DOI: https://doi.org/10.2138/am.2006.2190
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Parvo-mangano-edenite, parvo-manganotremolite, and the solid solution between Ca and Mn 2+ at the M4 site in amphiboles

Roberta Oberti, Fernando Cámara, Giancarlo Della Ventura, Gianluca Iezzi, Alan I. Benimoff
Published: 01 April 2006
American Mineralogist (2006) 91 (4): 526–532.
DOI: https://doi.org/10.2138/am.2006.1905
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