Regolith-hosted rare-earth elements: The phyllosilicate connection
W. Crawford Elliott

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Heirs of the revolution: X-ray diffraction and the birth of the Mineralogical Society of America
Peter J. Heaney

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Deep Earth carbon reactions through time and space
Catherine McCammon, Hélène Bureau, H. James Cleaves II, Elizabeth Cottrell, Susannah M. Dorfman, Louise H. Kellogg, Jie Li, Sami Mikhail, Yves Moussallam, Chrystele Sanloup, Andrew R. Thomson, and Alberto Vitale Brovarone

Magmatic carbon outgassing and uptake of CO₂ by alkaline waters
Marie Edmonds, Benjamin Tutolo, Kayla Iacovino, and Yves Moussallam

New insights into the evolution of Mississippi Valley-Type hydrothermal system: A case study of the Wusihe Pb-Zn deposit, South China, using quartz in-situ trace elements and sulfides in situ S-Pb isotopes
Kai Luo, Jia-Xi Zhou, Zhi-Long Huang, John Caulfield, Jian-Xin Zhao, Yue-Xing Feng, and Hegen Ouyang

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Celestine discovered in Hawaiian basalts
Michael O. Garcia and Eric Hellebrand

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Microstructural controls on the chemical heterogeneity of cassiterite revealed by cathodoluminescence and elemental X-ray mapping
Jason M. Bennett, Anthony I.S. Kemp, and Malcolm P. Roberts

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Hornblende as a tool for assessing mineral-melt equilibrium and recognition of crystal accumulation
Kevin Werts, Calvin G. Barnes, Valbone Memeti, Barbara Ratschbacher, Dustin Williams, and Scott R. Paterson

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The role of clay minerals in formation of the regolith-hosted heavy rare earth element deposits
Martin Yan Hei Li and Mei-Fu Zhou

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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, and Ferdinando Bosi

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Caseyite, a new mineral containing a variant of the flat-Al₁₃ polyoxometalate cation
Anthony R. Kampf, Mark A. Cooper, John M. Hughes, Barbara P. Nash, Frank C. Hawthorne, and Joe Marty

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Incorporation of Mg in phase Egg, AlSiO₃OH: Toward a new polymorph of phase H, MgSiH₂O₄, a carrier of water in the deep mantle 2 4
Luca Bindi, Aleksandra Bendeliani, Andrey Bobrov, Ekaterina Matrosova, and Tetsuo Irifune

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Imaging trace-element zoning in pyroxenes using synchrotron XRF mapping with the Maia detector array: Benefit of low-incident energy
Stephen J. Barnes, David Paterson, Teresa Ubide, Louise E. Schoneveld, Chris Ryan, and Margaux Le Vaillant

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“Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of diamond formed by gas phase condensation or chemical vapor deposition—Discussion
Konstantin D. Litasov, Tatyana B. Bekker, and Hiroyuki Kagi

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On “Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of CVD-formed diamond in nature—Reply to K.D. Litasov, T.B. Bekker, and H. Kagi
Felix V. Kaminsky, Richard Wirth, Leonid P. Anikin, and Anya Schreiber

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Memorial of Enver Murad 1941–2019
Janice L. Bishop, Helge Stanjek, John Cashion, and José Domingos Fabris

Erratum
Ruggero Vigliaturo, Reto Gieré

Erratum
Melanie Lorenz