This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press. DOI: https://doi.org/10.2138/am-2021-7598. http://www.minsocam.org/ 1 Revision 2 2+ 2 Zhanghuifenite, Na3Mn 4Mg2Al(PO4)6, a new mineral isostructural with 3 bobfergusonite, from the Santa Ana mine, San Luis province, Argentina 4 5 Hexiong Yang*1, Anaïs Kobsch2, Xiangping Gu3, Robert T. Downs1, Xiande Xie4 6 7 1Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721-0077, 8 USA 9 2Univ Lyon, ENSL, Univ Lyon 1, CNRS, LGL-TPE, F-69007 Lyon, France 10 3School of Geosciences and Info-Physics, Central South University, Changsha, Hunan 410083, 11 China 12 4Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, 13 and Guangdong Key Laboratory of Mineral Physics and Materials, Guangzhou 510640, China 14 15 *Corresponding author:
[email protected] 16 17 Abstract 2+ 18 A new mineral species, zhanghuifenite, ideally Na3Mn 4Mg2Al(PO4)6, has been 19 found in the Santa Ana mine, San Luis province, Argentina. It occurs in irregular veinlets 20 or patches, 5 mm thick, in a nodule of beusite interlaminated with lithiophilite. Broken 21 pieces of zhanghuifenite are blocky or tabular. Single crystals are up to 0.8 x 0.5 x 0.5 22 mm. No twinning or parting is observed macroscopically. The mineral is deep green, 23 transparent with pale green streak and vitreous luster. It is brittle and has a Mohs 24 hardness of ~5 with good cleavage on {010}.