Si-rich Mg-sursassite Mg₄Al₅Si₇O₂₃(OH)₅ with octahedrally coordinated Si: A new ultrahigh-pressure hydrous phase
Luca Bindi, Mark D. Welch, Aleksandra A. Bendeliani, and Andrey V. Bobrov

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Inherited Eocene magmatic tourmaline captured by the Miocene Himalayan leucogranites
Jinsheng Han, Pete Hollings, Fred Jourdan, Yunchuan Zeng, and Huayong Chen

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How American Mineralogist and the Mineralogical Society of America influenced a career in mineralogy, petrology, and plate pushing, and thoughts on mineralogy’s future role
W.G. Ernst

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Petrographic and spectral study of hydrothermal mineralization in drill core from Hawaii: A potential analog to alteration in the martian subsurface
Wendy M. Calvin, Nicole Lautze, Joe Moore, Donald Thomas, Eric Haskins, and Brandon P. Rasmussen

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Characterizing low-temperature aqueous alteration of Mars-analog basalts from Mauna Kea at multiple scales
Brandon P. Rasmussen, Wendy M. Calvin, Bethany L. Ehlmann, Thomas F. Bristow, Nicole Lautze, Abigail A. Fraeman, and Joel W. DesOrmeau

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Archean to Paleoproterozoic seawater halogen ratios recorded by fluid inclusions in chert and hydrothermal quartz
Ray Burgess, Sarah L. Goldsmith, Hirochika Sumino, Jamie D. Gilmour, Bernard Marty, Magali Pujol, and Kurt O. Konhauser

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Metasomatism-controlled hydrogen distribution in the Spitsbergen upper mantle
Wenting Tang, Hejiu Hui, Dmitri A. Ionov, Wei Chen, Lisha Zhang, and Yongjiang Xu

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Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica
Huawei Chen, Kurt Leinenweber, Vitali Prakapenka, Martin Kunz, Hans A. Bechtel, Zhenxian Liu, and Sang-Heon Shim

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Density and sound velocity of liquid Fe-S alloys at Earth’s outer core P-T conditions
Jie Fu, Lingzhi Cao, Xiangmei Duan, and Anatoly B. Belonoshko

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Some geometrical properties of fission-track-surface intersections in apatite
Raymond Jonckheere, Carolin Aslanian, Bastian Wauschkuhn, and Lothar Ratschbacher

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Thermal equation of state of post-aragonite CaCO_3-Pmmn
Mingda Lv, Jiachao Liu, Eran Greenberg, Vitali B. Prakapenka, and Susannah M. Dorfman

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Structure of NaFeSiO₄, NaFeSi₂O₆, and NaFeSi₃O₈ glasses and glass-ceramics
Mostafa Ahmadzadeh, Alex Scrimshire, Lucy Mottram, Martin C. Stennett, Neil C. Hyatt, Paul A. Bingham, and John S. McCloy

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Raman spectroscopic studies of O–H stretching vibration in Mn-rich apatites: A structural approach
Adam Pieczka, Bożena Gołębiowska, Piotr Jeleń, Maciej Sitarz, and Adam Szuszkiewicz

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Characterization of modified mineral waste material adsorbent as affected by thermal treatment for optimizing its adsorption of lead and methyl orange
Lingcheng Su, Jiajun Chen, Huada Ruan, Dongqi Chen, Xi Chen, and Chiuhong Lee

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Morin-type transition in 5C pyrrhotite
Charles R.S. Haines, Giulio I. Lampronti, Wim T. Klooster, Simon J. Coles, Sian E. Dutton, and Michael A. Carpenter

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The formation of marine red beds and iron cycling on the Mesoproterozoic North China Platform
Dongjie Tang, Jianbai Ma, Xiaoying Shi, Maxwell Lechte, and Xiqiang Zhou

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A multi-methodological study of kernite, a mineral commodity of boron
G. Diego Gatta, Alessandro Guastoni, Paolo Lotti, Giorgio Guastella, Oscar Fabelo, and Maria Teresa Fernandez-Diaz

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Memorial of F. Donald Bloss 1920–2020
Mickey E. Gunter