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Journal Article

Crystal structure, hydrogen bonding, and high-pressure behavior of the hydroxide perovskite MgSi(OH) 6 : A phase relevant to deep subduction of hydrated oceanic crust

Mark D. Welch, Jens Najorka, Bernd Wunder
Published: 01 February 2024
American Mineralogist (2024) 109 (2): 255–264.
DOI: https://doi.org/10.2138/am-2022-8889
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Si-rich Mg-sursassite Mg 4 Al 5 Si 7 O 23 (OH) 5 with octahedrally coordinated Si: A new ultrahigh-pressure hydrous phase

Luca Bindi, Mark D. Welch, Aleksandra A. Bendeliani, Andrey V. Bobrov
Published: 01 September 2020
American Mineralogist (2020) 105 (9): 1432–1435.
DOI: https://doi.org/10.2138/am-2020-7533
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The tetrahedrite group: Nomenclature and classification

Cristian Biagioni, Luke L. George, Nigel J. Cook, Emil Makovicky, Yves Moëlo, Marco Pasero, Jiří Sejkora, Chris J. Stanley, Mark D. Welch, Ferdinando Bosi
Published: 01 January 2020
American Mineralogist (2020) 105 (1): 109–122.
DOI: https://doi.org/10.2138/am-2020-7128
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Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): Recrystallization, transformation, and metamict states in chevkinite

Marcin Stachowicz, Mark D. Welch, Bogusław Bagiński, Pavel M. Kartashov, Ray Macdonald, Krzysztof Woźniak
Published: 01 October 2019
American Mineralogist (2019) 104 (10): 1481–1486.
DOI: https://doi.org/10.2138/am-2019-6458
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Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): X-ray diffraction and photoelectron spectroscopy studies and mechanisms of Nb enrichment

Marcin Stachowicz, Bogusław Bagiński, Mark D. Welch, Pavel M. Kartashov, Ray Macdonald, Jacek Balcerzak, Jacek Tyczkowski, Krzysztof Woźniak
Published: 01 April 2019
American Mineralogist (2019) 104 (4): 595–602.
DOI: https://doi.org/10.2138/am-2019-6457
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Sodium amphibole in the post-glaucophane high-pressure domain: The role of eckermannite

Harriet Howe, Alison R. Pawley, Mark D. Welch
Published: 01 June 2018
American Mineralogist (2018) 103 (6): 989–992.
DOI: https://doi.org/10.2138/am-2018-6399
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Further complexities of the 10 Å phase revealed by infrared spectroscopy and X-ray diffraction

Alison R. Pawley, Mark D. Welch
Published: 01 April 2014
American Mineralogist (2014) 99 (4): 712–719.
DOI: https://doi.org/10.2138/am.2014.4685
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New structural features of the high-pressure synthetic sheet-disilicate Phase-X, K (2− x ) Mg 2 Si 2 O 7 H x

Mark D. Welch, Jürgen Konzett, Luca Bindi, Simon C. Kohn, Daniel J. Frost
Published: 01 November 2012
American Mineralogist (2012) 97 (11-12): 1849–1857.
DOI: https://doi.org/10.2138/am.2012.4164
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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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New Mineral Names

Dmitry Belakovskiy, Mark D. Welch, Fernando Cámara, G. Diego Gatta, Kimberly T. Tait
Published: 01 August 2012
American Mineralogist (2012) 97 (8-9): 1523–1530.
DOI: https://doi.org/10.2138/am.2012.596
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New Mineral Names

Kimberly T. Tait, Dmitry Belakovskiy, Mark D. Welch, G. Diego Gatta, Fernando Cámara
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1260–1265.
DOI: https://doi.org/10.2138/am.2012.595
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The high-pressure behavior of orthorhombic amphiboles

Mark D. Welch, G. Diego Gatta, Nicola Rotiroti
Published: 01 April 2011
American Mineralogist (2011) 96 (4): 623–630.
DOI: https://doi.org/10.2138/am.2011.3670
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Volume behavior of the 10 Å phase at high pressures and temperatures, with implications for H 2 O content

Alison R. Pawley, Mark D. Welch, Alistair R. Lennie, Raymond L. Jones
Published: 01 November 2010
American Mineralogist (2010) 95 (11-12): 1671–1678.
DOI: https://doi.org/10.2138/am.2010.3526
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Pressure-induced transformations in kaolinite

Mark D. Welch, Wilson A. Crichton
Published: 01 April 2010
American Mineralogist (2010) 95 (4): 651–654.
DOI: https://doi.org/10.2138/am.2010.3408
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The acoustic emissions signature of a pressure-induced polytypic transformation in chlorite

David P. Dobson, Almar A. De Ronde, Mark D. Welch, Philip G. Meredith
Published: 01 February 2007
American Mineralogist (2007) 92 (2-3): 437–440.
DOI: https://doi.org/10.2138/am.2007.2389
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A high-pressure polytypic transformation in type-I chlorite

Mark D. Welch, Wilson A. Crichton
Published: 01 July 2005
American Mineralogist (2005) 90 (7): 1139–1145.
DOI: https://doi.org/10.2138/am.2005.1756
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The crystal-structure of synthetic NaNa 2 Mg 5 Si 8 O 21 (OH) 3 , a triclinic C 1̅ amphibole with a triple-cell and excess hydrogen

Fernando Cámara, Roberta Oberti, Giancarlo Della Ventura, Mark D. Welch, Walter V. Maresch
Published: 01 October 2004
American Mineralogist (2004) 89 (10): 1464–1473.
DOI: https://doi.org/10.2138/am-2004-1014
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Novel high-pressure behavior in chlorite: A synchrotron XRD study of clinochlore to 27 GPa

Mark D. Welch, Annette K. Kleppe, Andrew P. Jephcoat
Published: 01 August 2004
American Mineralogist (2004) 89 (8-9): 1337–1340.
DOI: https://doi.org/10.2138/am-2004-8-923
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Thermochemistry of guest-free melanophlogite

Alexandra Navrotsky, Hongwu Xu, Eric C. Moloy, Mark D. Welch
Published: 01 October 2003
American Mineralogist (2003) 88 (10): 1612–1614.
DOI: https://doi.org/10.2138/am-2003-1026
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The effect of pressure upon hydrogen bonding in chlorite: A Raman spectroscopic study of clinochlore to 26.5 GPa

Annette K. Kleppe, Andrew P. Jephcoat, Mark D. Welch
Published: 01 April 2003
American Mineralogist (2003) 88 (4): 567–573.
DOI: https://doi.org/10.2138/am-2003-0410
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