Three new borate minerals rhabdoborite-(V), rhabdoborite-(Mo) and rhabdoborite-(W), forming the rhabdoborite group, are found in the Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. They are closely associated with each other and anhydrite, diopside, hematite, schäferite, berzeliite, svabite, calciojohillerite, ludwigite, forsterite, magnesioferrite, baryte, fluorapatite, udinaite, arsenudinaite, and powellite. Rhabdoborites form long-prismatic to acicular crystals up to 0.04 × 0.04 × 7 mm3 typically combined in aggregates up to 1 cm. They are transparent, light yellow, with vitreous lustre. The empirical formulae of holotypes, calculated based on 26 O + F apfu, are: rhabdoborite-(V): (Mg11.85Fe3+0.11Mn0.06Ca0.02)Σ12.04(V5+0.70Mo6+0.36W6+0.21Te6+0.01)Σ1.28[(P0.35As5+0.16)Σ0.51B5.50]Σ6.01O24.35F1.65; rhabdoborite-(Mo): (Mg11.78Mn0.07Fe3+0.06Ca0.06)Σ11.97(Mo6+0.65V5+0.49W6+0.19)Σ1.33[(P0.31As5+0.14)Σ0.45B5.54]Σ5.99O24.33F1.67; rhabdoborite-(W): (Mg11.74Fe3+0.09Ca0.03Mn0.02)Σ11.88(W6+0.75V5+0.44Mo6+0.13)Σ1.32[(P0.25As5+0.13)Σ0.38B5.65]Σ6.03O24.42F1.58. The simplified formulae are: rhabdoborite-(V): Mg12(V5+,M6+)113O6\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\text{Mg}}_{12}}({\text{V}}^{5+}, M^{6+})_{1\nicefrac{1}{3}}{{\text{O}}_{6}}$$\end{document}{(BO3)6–x(PO4)xF2–x} (M6+ = Mo, W and x < 1); rhabdoborite-(Mo): Mg12Mo1136+O6\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\text{Mg}}_{12}}{{\text{Mo}}_{\;\;\; 1\nicefrac{1}{3}}^{6+}}{{\text{O}}_{6}}$$\end{document}(BO3)6F2; rhabdoborite-(W): Mg12W1136+O6\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\text{Mg}}_{12}}{\text{W}}_{\;\;\; 1\nicefrac{1}{3}}^{6+}{{\text{O}}_{6}}$$\end{document}(BO3)6F2. Rhabdoborites are hexagonal, P63, and Z = 1. The unit-cell parameters of rhabdoborite-(V)/rhabdoborite-(Mo)/rhabdoborite-(W) are: a 10.6314(4)/10.6304(3)/10.6366(5), c 4.5661(2)/4.56374(16)/4.5701(3) Å, and V 446.95(3)/446.63(3)/447.78(4) Å3. The crystal structures were solved from single-crystal XRD data, R1 = 0.0413, 0.0289 and 0.0418 for rhabdoborite-(V), rhabdoborite-(Mo) and rhabdoborite-(W), respectively. These isostructural minerals represent a novel structure type. The structure is based on a three-dimensional network (pseudo-framework) built by the (0001) layers formed by clusters Mg6O21F composed by Mg-centred octahedra and linked via BO3 triangles. The distorted octahedra MO6 (M = V5+, Mo6+, W6+) are located in gaps in the layers. The pair of anions, (BO3)3− triangle and adjacent F−, is partially substituted by the (P,As5+)O43− tetrahedral anion. Rhabdoborites form a continuous solid-solution system in which contents of V, Mo and W are the main varying values. The rootname rhabdoborite reflects morphological (rhabdos is rod, in Greek) and chemical (borate) features of the minerals; the suffix-(V), -(Mo) or -(W) indicates predominant, species-defining M component.

中文翻译：

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菱镁矿-(V)、菱镁矿-(Mo) 和菱镁矿-(W)：一组新的硼酸盐矿物，通式为 $${{\text{Mg}}_{12}} {M_{1\nicefrac{ 1}{3}}} {{\text{O}}_{6}}$$[(BO3)6–x(PO4)xF2–x] (M = V5+, Mo6+ or W6+ and x < 1)

在 Arsenatnaya 喷气孔、托尔巴奇克大裂隙喷发北部突破口的第二个火山渣锥中发现了三种新的硼酸盐矿物斜纹长石-(V)、斜纹长石-(Mo) 和斜纹长石-(W)，形成了斜纹长石群，堪察加，俄罗斯。它们与硬石膏、透辉石、赤铁矿、菱镁矿、berzeliite、svabite、calciojohillerite、ludwigite、镁橄榄石、magnesioferrite、重晶石、氟磷灰石、udinaite、arsenudinaite和powellite彼此密切相关。菱镁矿形成长达 0.04 × 0.04 × 7 mm3 的长棱柱状至针状晶体，通常结合成高达 1 cm 的聚集体。它们是透明的，淡黄色，有玻璃光泽。基于 26 O + F apfu 计算的正模经验公式为：菱镁矿-(V): (Mg11.85Fe3+0.11Mn0.06Ca0.02)Σ12.04(V5+0.70Mo6+0.36W6+0.21Te6+ 0. 01)Σ1.28[(P0.35As5+0.16)Σ0.51B5.50]Σ6.01O24.35F1.65；菱镁矿-(Mo)：(Mg11.78Mn0.07Fe3+0.06Ca0.06)Σ11.97(Mo6+0.65V5+0.49W6+0.19)Σ1.33[(P0.31As5+0.14)Σ0.45B5.54]Σ5 .99O24.33F1.67；菱镁矿-(W)：(Mg11.74Fe3+0.09Ca0.03Mn0.02)Σ11.88(W6+0.75V5+0.44Mo6+0.13)Σ1.32[(P0.25As5+0.13)Σ0.38B5.65]Σ6 .03O24.42F1.58。简化公式为：菱镁矿-(V): Mg12(V5+,M6+)113O6\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy } \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\text{Mg}}_{12}}({\text{V}}^ {5+}, M^{6+})_{1\nicefrac{1}{3}}{{\text{O}}_{6}}$$\end{document}{(BO3)6– x(PO4)xF2–x} (M6+ = Mo, W and x < 1); 菱镁矿-(Mo): Mg12Mo1136+O6\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\ oddsidemargin}{-69pt} \begin{document}$${{\text{Mg}}_{12}}{{\text{Mo}}_{\;\;\; 1\nicefrac{1}{3}}^{6+}}{{\text{O}}_{6}}$$\end{document}(BO3)6F2; 菱镁矿-(W): Mg12W1136+O6\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{ upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\text{Mg}}_{12}}{\text{W}}_{\;\;\; 1\nicefrac{1}{3}}^{6+}{{\text{O}}_{6}}$$\end{document}(BO3)6F2. 菱镁矿为六方晶系，P63，Z = 1。菱镁矿-(V)/菱镁矿-(Mo)/菱镁矿-(W)的晶胞参数为：a 10.6314(4)/10。6304(3)/10.6366(5)，c 4.5661(2)/4.56374(16)/4.5701(3) Å，和 V 446.95(3)/446.63(3)/447.78(4) Å3。晶体结构是从单晶 XRD 数据中解出的，R1 = 0.0413、0.0289 和 0.0418，分别用于菱镁矿-(V)、菱镁矿-(Mo) 和菱镁矿-(W)。这些同构矿物代表了一种新的结构类型。该结构基于由以镁为中心的八面体组成的团簇 Mg6O21F 形成的 (0001) 层构建的三维网络（伪框架），并通过 BO3 三角形连接。扭曲的八面体 MO6 (M = V5+, Mo6+, W6+) 位于层间的间隙中。(BO3)3- 三角形和相邻的 F- 阴离子对被 (P,As5+)O43- 四面体阴离子部分取代。菱镁矿形成一个连续的固溶体系统，其中 V、Mo 和 W 的含量是主要的变化值。根名rhabdoborite 反映了矿物的形态（rhabdos 在希腊语中是棒）和化学（硼酸盐）特征；后缀-(V)、-(Mo) 或-(W) 表示主要的、物种定义的 M 成分。