An evolutionary system of mineralogy. Part III: Primary chondrule mineralogy (4566 to 4561 Ma)
Robert M. Hazen, Shaunna M. Morrison, and Anirudh Prabhu

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Raman spectroscopy study of manganese oxides: Layer structures
Jeffrey E. Post, David A. McKeown, and Peter J. Heaney

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Raman signatures of the distortion and stability of MgCO₃ to 75 GPa
Chaoshuai Zhao, Chaojia Lv, Liangxu Xu, Lin Liang, Jin Liu

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Competitive adsorption geometries for the arsenate As(V) and phosphate P(V) oxyanions on magnetite surfaces: Experiments and theory
Xiaoliang Liang, Xiaoju Lin, Gaoling Wei, Lingya Ma, Hongping He, David Santos-Carballal, Jianxi Zhu, Runliang Zhu, and Nora H. De Leeuw

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Probing the transformation paths from aluminum (oxy)hydroxides (boehmite, bayerite, and gibbsite) to metastable alumina: A view from high-resolution ²⁷Al MAS NMR
Hyo-Im Kim and Sung Keun Lee

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Crystal structures of K-cymrite and kokchetavite from single-crystal X-ray diffraction
Alexandr V. Romanenko, Sergey V. Rashchenko, Alexander G. Sokol, Andrey V. Korsakov, Yurii V. Seryotkin, Konstantin V. Glazyrin, and Kira Musiyachenko

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Fluid source and metal precipitation mechanism of sediment-hosted Chang’an orogenic gold deposit, SW China: Constraints from sulfide texture, trace element, S, Pb, and He-Ar isotopes and calcite C-O isotopes
Lin Yang, Qingfei Wang, Ross R. Large, Indrani Mukherjee, Jun Deng, Huajian Li, Huazhi Yu, and Xuan Wang

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Iron isotope fractionation in reduced hydrothermal gold deposits: A case study of the Wulong gold deposit, Liaodong Peninsula, East China
Jiahao Zheng, Bin Chen, Shuaijie Liu, and Chuang Bao

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Tungsten mineralization during the evolution of a magmatic- hydrothermal system: Mineralogical evidence from the Xihuashan rare-metal granite in South China
Jie Li, Xiao-Long Huang, Qi Fu, and Wu-Xian Li

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Crystallization and melt extraction of a garnet-bearing charnockite from South China: Constraints from petrography, geochemistry, mineral thermometry, and rhyolite-MELTS modeling
Xi-Song Zhang, Xi-Sheng Xu, Yan Xia, and Kai Zhao

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Reducing epistemic and model uncertainty in ionic inter-diffusion chronology: A 3D observation and dynamic modeling approach using olivine from Piton de la Fournaise, La Réunion
Fiona K. Couperthwaite, Daniel J. Morgan, Matthew J. Pankhurst, Peter D. Lee, and James M.D. Day

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Memorial of James Joseph Papike (1937–2020)
Charles K. “Chip” Shearer and Steven B. Simon

ERRATUM
Georg F Zellmer, Mattia Pistone, Yoshiyuki Iizuka, Benjamin J Andrews, Arturo Gomez-Tuena, Susanne M Straub, Elizabeth Cottrell