A new mineral species, zhanghuifenite, ideally Na3Mn42+Mg2Al(PO4)6, has been found in the Santa Ana mine, San Luis province, Argentina. It occurs in irregular veinlets or patches, 5 mm thick, in a nodule of beusite interlaminated with lithiophilite. Broken pieces of zhanghuifenite are blocky or tabular. Single crystals are up to 0.8 × 0.5 × 0.5 mm. No twinning or parting is observed macroscopically. The mineral is deep green, transparent with pale green streak and vitreous luster. It is brittle and has a Mohs hardness of ~5 with good cleavage on {010}. The measured and calculated densities are 3.63(2) and 3.62 g/cm3, respectively. Optically, zhanghuifenite is biaxial (+), with α = 1.675(2), β = 1.680(2), γ = 1.690(2) (white light), 2V (meas) = 74(2)°, and 2V (calc) = 71°. The calculated compatibility index based on the empirical formula is 0.020 (excellent). An electron microprobe analysis yields an empirical formula (based on 24 O apfu) (Na2.80Ca0.11)Σ2.91(⁠Mn3.092+Fe0.472+Mg0.36)Σ3.92(Mg1.31Fe0.692+⁠)Σ2.00 (Al0.81Fe0.193+⁠)(PO4)6. Zhanghuifenite is insoluble in water or hydrochloric acid.Zhanghuifenite is isostructural with bobfergusonite, a member of the alluaudite supergroup. It is monoclinic, with space group P21/n, Z = 4, and unit-cell parameters a = 12.8926(3), b = 12.4658(3), c = 10.9178(2) Å, β = 97.9200(10)°, and V = 1737.93(7) Å3. The crystal structure of zhanghuifenite contains six octahedral M (= Mn, Fe, Mg, Al) sites and five X (= Na, Mn, Ca) sites with coordination numbers between 6 and 8. The six M octahedra share edges to form two types of kinked chains extending along [101], with one consisting of M1-M4-M5 and the other M2-M3-M6. These chains are joined by PO4 tetrahedra to form sheets parallel to (010), which are linked together through corner-sharing between PO4 tetrahedra and MO6 octahedra in the adjacent sheets, leaving open channels parallel to a, where the large X cations are situated. Zhanghuifenite differs from bobfergusonite in two major aspects. One is that the M4 and M5 sites in the former are mainly occupied by Mg, but by Fe2+ and Fe3+, respectively, in the latter. The other is that the X2-X5 sites in zhanghuifenite are all nearly or fully filled with Na, resulting in 3 Na apfu in the ideal formula, but X4 and X5 are merely half-occupied in bobfergusonite, giving rise to 2 Na apfu.

中文翻译：

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Zhanghuifenite，Na3Mn42+Mg2Al(PO4)6，一种与bbfergusonite同构的新矿物，来自阿根廷圣路易斯省的Santa Ana矿

在阿根廷圣路易斯省的圣安娜矿中发现了一种新的矿物——张辉芬石，理想情况是 Na3Mn42+Mg2Al(PO4)6。它出现在不规则的细脉或斑块中，5 毫米厚，​​在与亲锂岩交错的铝矾土结节中。章汇粉石的碎块呈块状或片状。单晶最大可达 0.8 × 0.5 × 0.5 mm。宏观上没有观察到孪晶或分离。矿物呈深绿色，透明，有淡绿色条纹和玻璃光泽。它很脆，莫氏硬度约为 5，在 {010} 上有良好的解理。测量和计算的密度分别为 3.63(2) 和 3.62 g/cm3。光学上，章辉芬石是双轴 (+)，α = 1.675(2)，β = 1.680(2)，γ = 1.690(2)（白光），2V (meas) =​​ 74(2)°，2V ) = 71°。根据经验公式计算出的相容性指数为0。020（优秀）。电子探针分析得出一个经验公式（基于 24 O apfu） (Na2.80Ca0.11)Σ2.91(⁠Mn3.092+Fe0.472+Mg0.36)Σ3.92(Mg1.31Fe0.692+⁠ )Σ2.00 (Al0.81Fe0.193+⁠)(PO4)6。章辉粉矿不溶于水或盐酸。章辉粉矿与闪辉石超群的一员辉长石具有同构。它是单斜晶系，空间群 P21/n，Z = 4，晶胞参数 a = 12.8926(3)，b = 12.4658(3)，c = 10.9178(2) Å，β = 97.9200(10)°， V = 1737.93(7) Å3。zhanghuifenite 的晶体结构包含六个八面体 M (= Mn, Fe, Mg, Al) 位点和五个 X (= Na, Mn, Ca) 位点，配位数在 6 和 8 之间。六个 M 八面体共享边缘形成两种类型沿着 [101] 延伸的扭结链，其中一个由 M1-M4-M5 和另一个 M2-M3-M6 组成。这些链由 PO4 四面体连接形成平行于 (010) 的薄片，它们通过相邻薄片中 PO4 四面体和 MO6 八面体之间的角共享连接在一起，留下平行于 a 的开放通道，其中大 X 阳离子位于。章辉芬石与硼镁铝榴石的区别主要有两个方面。一是前者的 M4 和 M5 位点主要被 Mg 占据，而后者则分别被 Fe2+和 Fe3+占据。另一个是章辉粉矿中的X2-X5位点几乎或完全被Na填充，在理想的配方中产生3 Na apfu，而X4和X5仅占一半在bobfergusonite中，产生2 Na apfu。留下平行于 a 的开放通道，其中大 X 阳离子位于。章辉芬石与硼镁铝榴石的区别主要有两个方面。一是前者的 M4 和 M5 位点主要被 Mg 占据，而后者则分别被 Fe2+和 Fe3+占据。另一个是章辉粉矿中的X2-X5位点几乎或完全被Na填充，导致理想配方中的3 Na apfu，而X4和X5仅半占在bbfergusonite中，产生2 Na apfu。留下平行于 a 的开放通道，其中大 X 阳离子位于。章辉芬石与硼镁铝榴石的区别主要有两个方面。一是前者的 M4 和 M5 位点主要被 Mg 占据，而后者则分别被 Fe2+和 Fe3+占据。另一个是章辉粉矿中的X2-X5位点几乎或完全被Na填充，在理想的配方中产生3 Na apfu，而X4和X5仅占一半在bobfergusonite中，产生2 Na apfu。