Eu speciation in apatite at 1 bar: An experimental study of valence-state partitioning by XANES, lattice strain, and Eu/Eu* in basaltic systems
Nicholas D. Tailby, Dustin Trail, E. Bruce Watson, Antonio Lanzirotti, Matthew Newville, and Yanling Wang

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The effect of composition on chlorine solubility and behavior in silicate melts
Richard W. Thomas and Bernard J. Wood

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High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO₃OH system
Goru Takaichi, Masayuki Nishi, Youmo Zhou, Shinichi Machida, Ginga Kitahara, Akira Yoshiasa, and Tetsuo Irifune

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Crystallization of spinel from coexisting silicate and sulfide immiscible liquids: An equilibrium case with postcumulus reactions
Ya-Jing Mao, Stephen J. Barnes, Louise Schoneveld, Belinda Godel, Morgan Williams, Dongmei Tang, Zhen Kang, and Ke-Zhang Qin

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X-ray absorption spectroscopy study of Mn reference compounds for Mn speciation in terrestrial surface environments
Teresa Zahoransky, Anna V. Wegorzewski, Winnie Huong, and Christian Mikutta

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Heterogeneous and retarded phase transformation of ferrihydrite on montmorillonite surface: The important role of surface interactions
Hongyan Wei, Jing Liu, Qingze Chen, Runliang Zhu, Lixia Yan, Yixuan Yang, Xiaoliang Liang, Jianxi Zhu, and Hongping He

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Atomic-scale characterization of the oxidation state of Ti in meteoritic hibonite: Implications for early solar system thermodynamics
Pierre-Marie Zanetta, Venkateswara Rao Manga, Yao-Jen Chang, Tarunika Ramprasad, Juliane Weber, John R. Beckett, and Thomas J. Zega

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Structural behavior of C2/m tremolite to 40 GPa: A highpressure single-crystal X-ray diffraction study
Jason N. Ott, Bora Kalkan, Martin Kunz, Genesis Berlanga, Ali F. Yuvali, and Quentin Williams

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Optimizing Raman spectral collection for quartz and zircon crystals for elastic thermobarometry
Mayara F. Cizina, T. Dylan Mikesell, and Matthew J. Kohn

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Measuring H₂O concentrations in olivine by secondary ion mass spectrometry: Challenges and paths forward
W. Henry Towbin, Terry Plank, Emily Klein, and Erik Hauri

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Arsenic clustering in arsenian pyrite: A combined photoemission and theoretical modeling study
Reza Mahjoub, Marta Krasowska, Nikki Stanford, William Skinner, and Philip Forson

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High-pressure electrical conductivity and elasticity of ironbearing δ-AlOOH
Xiaowan Su, Jin Liu, Yukai Zhuang, Chaojia Lv, Xuyong Pang, Fuyang Liu, Xiaohui Yu, and Qiang Sun

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Nudged elastic band calculations of the (4H)^X _Si hydrogarnet type defect in Mg₂SiO₄ forsterite
Brent T. Poe and Maria Grazia Perna

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Mn substitution and distribution in goethite and influences on its photocatalytic properties: A combined study using first-principles calculations and photocatalytic experiments
Xin Liu, Huan Liu, Meirong Zong, Meng Chen, Hongping He, Rucheng Wang, and Xiancai Lu

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Incorporating previously neglected excess oxygen associated with ferric iron in matrix corrections of microprobe data from cubic and rhombohedral Fe-Ti oxides
Michael A. Dungan, John J. Donovan, Andrew J. Locock, and Emma S. Bullock

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Recycled carbonates in the mantle sources of natural kamafugites: A zinc isotope perspective
Lei Ma, Sheng-Ao Liu, Zhidan Zhao, and Xue-Hui Yu

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Raman analysis of octocoral carbonate ion structural disorder along a natural depth gradient, Kona coast, Hawai‘i
Kyle Conner, Shiv Sharma, Ryohei Uchiyama, Kentaro Tanaka, Naoko Murakami-Sugihara, Kotaro Shirai, and Samuel Kahng

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Memorial of Charles Wilson Burnham, 1933–2021
Mark Van Baalen, Charles H. Langmuir, and Michael B. McElroy

ERRATUM
Andrew Jackson