Discovery of the first natural hydride
Luca Bindi, Fernando Cámara, William L. Griffin, Jin-Xiang Huang, Sarah E.M. Gain, Vered Toledo, and Suzanne Y. O’Reilly

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Synthesis of pigeonites for spectroscopic studies
Donald H. Lindsley, Hanna Nekvasil, and Timothy D. Glotch

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Deep carbon cycle through five reactions
Jie Li, Simon A.T. Redfern, and Donato Giovannelli

Earth in five reactions: Grappling with meaning and value in science
Robert M. Hazen

In-situ iron isotope analyses reveal igneous and magmatic-hydrothermal growth of magnetite at the Los Colorados Kiruna-type iron oxide-apatite deposit, Chile
Jaayke L. Knipping, Adrian Fiege, Adam C. Simon, Martin Oeser, Martin Reich, and Laura D. Bilenker

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Carbon and nitrogen isotopes and mineral inclusions in diamonds from chromitites of the Mirdita ophiolite 
(Albania) demonstrate recycling of oceanic crust into the mantle
Weiwei Wu, Jingsui Yang, Richard Wirth, Jianping Zheng, Dongyang Lian, Tian Qiu, and Ibrahim Milushi

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Geochronology and trace element mobility in rutile from a Carboniferous syenite pegmatite and the role of halogens
Georgia Pe-Piper, Justin Nagle, David J.W. Piper, and Chris R.M. McFarlane

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The incorporation of chlorine into calcium amphibole
David M. Jenkins

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Crystal size distribution of amphibole grown from hydrous basaltic melt at 0.6–2.6 GPa and 860–970 °C
Bo Zhang, Xianxu Hu, Paul D. Asimow, Xin Zhang, Jingui Xu, Dawei Fan, and Wenge Zhou

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Role of micropores, mass transfer, and reaction rate in the hydrothermal alteration process of plagioclase in a granitic pluton
Takashi Yuguchi, Kaho Shoubuzawa, Yasuhiro Ogita, Koshi Yagi, Masayuki Ishibashi, Eiji Sasao, and Tadao Nishiyama

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Lead diffusion in CaTiO₃: A combined study using Rutherford backscattering and TOF-SIMS for depth profiling to reveal the role of lattice strain in diffusion processes
Christopher Beyer, Ralf Dohmen, Detlef Rogalla, Hans-Werner Becker, Katharina Marquardt, Christian Vollmer, Ulrich Hagemann, Nils Hartmann, and Sumit Chakraborty

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On growth and form of etched fission tracks in apatite: 
A kinetic approach
Raymond Jonckheere, Bastian Wauschkuhn, and Lothar Ratschbacher

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High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate
Dongzhou Zhang, Yi Hu, Jingui Xu, Robert T. Downs, Julia E. Hammer, and Przemyslaw K. Dera

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Phase transition of wadsleyite-ringwoodite in the Mg₂SiO₄-Fe₂SiO₄ system
Noriyoshi Tsujino, Takashi Yoshino, Daisuke Yamazaki, Moe Sakurai, Wei Sun, Fang Xu, Yoshinori Tange, and Yuji Higo

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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, and Krzysztof Woźniak

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Meyrowitzite, Ca(UO₂)(CO₃)₂·5H₂O, a new mineral with a novel uranyl-carbonate sheet
Anthony R. Kampf, Jakub Plášil, Travis A. Olds, Barbara P. Nash, Joe Marty, and Harvey E. Belkin

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Presentation of the 2018 Roebling Medal of the Mineralogical Society of America to E. Bruce Watson
Frank Richter

Acceptance of the 2018 Roebling Medal of the Mineralogical Society of America
E. Bruce Watson

Presentation of the Dana Medal of the Mineralogical Society of America for 2018 to Jörg Hermann
Bradley R. Hacker

Acceptance of the Dana Medal of the Mineralogical Society of America for 2018
Jörg Hermann

Book Review
Alexander Gysi