The new crichtonite-group mineral saranovskite, ideally SrCaFe2+2(Cr4Ti2)Ti12O38, was discovered in the Glavnoe Saranovskoe deposit, Middle Urals, Russia, and named after the type locality. The associated minerals are chromite, Cr-bearing clinochlore, and calcite. Saranovskite forms black crude equant crystals about 2 mm across. The lustre is submetallic, and the streak is brownish-gray. Cleavage is not observed. The Mohs hardness is 6. Density calculated using the empirical formula is equal to 4.501 g cm–3. The reflectance spectra in visible range are given. The IR spectrum shows the absence of H-, B- and C-bearing groups. The Raman spectrum of saranovskite confirms the absence of H-bearing groups and indicates a rather high degree of ordering of Ti4+ and lower-valence cations. The chemical composition of saranovskite is (wt.%; electron microprobe, total iron apportioned between FeO and Fe2O3 taking into account charge balance): MgO 2.01, CaO 1.43, MnO 0.21, FeO 8.14, SrO 3.27, BaO 2.18, Al2O3 0.53, Sc2O3 0.69, Cr2O3 10.27, Fe2O3 2.19, Y2O3 1.56, La2O3 0.94, Ce2O3 0.91, Pr2O3 0.14, Nd2O3 0.35, TiO2 64.25, ZrO2 0.58, total 99.65. The crystal chemical formula of saranovskite is (Sr0.55Ba0.25Ln0.10Ca0.10)(Ca0.36Y0.25Ln0.16Fe2+0.08Zr0.10Mn0.05) (Fe2+1.12Mg0.88)(Cr3+2.34Ti2.28Fe2+0.91Fe3+0.11Al0.18Sc3+0.18)(Ti5.82Fe3+0.18)Ti6.0O38. The idealized formula is SrCaFe2+2(Cr4Ti2)Ti12O38. The crystal structure was determined using single-crystal X-ray diffraction data and refined to R = 0.0243. The new mineral is isostructural to other crichtonite-group members. Saranovskite is trigonal, space group R3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\overline{3}$$\end{document}, with a = 10.3553(2) Å, c = 20.7301(4) Å, V = 1925.12(8) Å3 and Z = 3. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 3.398 (75) (024), 2.881 (100) (– 126), 2.842 (65) (– 234), 2.247 (67) (– 144). 2.137 (76) (– 345), 1.799 (63) (– 348), 1.597 (72) (– 1.4.10, 152), 1.439 (76) (520).

中文翻译：

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Saranovskite，SrCaFe2+2(Cr4Ti2)Ti12O38，一种新的锂辉石族矿物

在俄罗斯中乌拉尔地区的 Glavnoe Saranovskoe 矿床中发现了新的锂辉石族矿物萨拉诺夫钛矿，理想情况下为 SrCaFe2+2(Cr4Ti2)Ti12O38，并以类型产地命名。伴生矿物是铬铁矿、含铬斜绿石和方解石。Saranovskite 形成约 2 毫米宽的黑色粗晶。光泽为亚金属，条纹为棕灰色。未观察到解理。莫氏硬度为 6。使用经验公式计算的密度等于 4.501 g cm-3。给出了可见光范围内的反射光谱。IR 光谱显示不存在含 H、B 和 C 的基团。saranovskite 的拉曼光谱证实不存在含氢基团，并表明 Ti4+ 和低价阳离子的有序程度相当高。saranovskite的化学成分为(wt.%; 电子微探针，总铁在 FeO 和 Fe2O3 之间分配（考虑到电荷平衡）：MgO 2.01、CaO 1.43、MnO 0.21、FeO 8.14、SrO 3.27、BaO 2.18、Al2O3 0.53、Sc2O3 0.203、203、103、203、16、16、23 La2O3 0.94、Ce2O3 0.91、Pr2O3 0.14、Nd2O3 0.35、TiO2 64.25、ZrO2 0.58，合计99.65。萨拉诺夫钛矿的晶体化学式为(Sr0.55Ba0.25Ln0.10Ca0.10)(Ca0.36Y0.25Ln0.16Fe2+0.08Zr0.10Mn0.05)(Fe2+1.12Mg0.88)(Cr3+2.34Ti2.10) 0.91Fe3+0.11Al0.18Sc3+0.18)(Ti5.82Fe3+0.18)Ti6.0O38。理想化的公式是 SrCaFe2+2(Cr4Ti2)Ti12O38。使用单晶 X 射线衍射数据确定晶体结构并精制至 R = 0.0243。这种新矿物与其他锂辉石族成员具有同构。Saranovskite 是三角形的，空间群 R3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{ \oddsidemargin}{-69pt} \begin{document}$$\overline{3}$$\end{document}，a = 10.3553(2) Å，c = 20.7301(4) Å，V = 1925.12(8) Å3 和 Z = 3。 粉末 X 射线衍射图的最强谱线 [d, Å (I, %) (hkl)] 为：3.398 (75) (024), 2.881 (100) (– 126), 2.842 (65) (– 234)、2.247 (67) (– 144)。2.137 (76) (– 345)、1.799 (63) (– 348)、1.597 (72) (– 1.4.10、152)、1.439 (76) (520)。粉末 X 射线衍射图的最强谱线 [d, Å (I, %) (hkl)] 为：3.398 (75) (024)、2.881 (100) (– 126)、2.842 (65) (– 234 ), 2.247 (67) (– 144)。2.137 (76) (– 345)、1.799 (63) (– 348)、1.597 (72) (– 1.4.10、152)、1.439 (76) (520)。粉末 X 射线衍射图的最强谱线 [d, Å (I, %) (hkl)] 为：3.398 (75) (024)、2.881 (100) (– 126)、2.842 (65) (– 234 ), 2.247 (67) (– 144)。2.137 (76) (– 345)、1.799 (63) (– 348)、1.597 (72) (– 1.4.10、152)、1.439 (76) (520)。