Abstract Two new isostructural minerals radekškodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekškodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekškodaite-(La) is associated with allanite-(Ce), allanite-(La), bastnäsite-(Ce), bastnäsite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperbøeite-(La), fluorbritholite-(Ce), törnebohmite-(Ce) and törnebohmite-(La). Radekškodaite-(Ce) is associated with ancylite-(Ce), bastnäsite-(Ce), bastnäsite-(La), lanthanite-(La), perbøeite-(Ce) and törnebohmite-(Ce). The new minerals form isolated anhedral grains up to 0.35 × 0.75 mm [radekškodaite-(La)] and 1 mm × 2 mm [radekškodaite-(Ce)]. Both minerals are greenish-brown with vitreous lustre. Dcalc = 4.644 [radekškodaite-(La)] and 4.651 [radekškodaite-(Ce)] g cm–3. Both minerals are optically biaxial (+); radekškodaite-(La): α = 1.790(7), β = 1.798(5), γ = 1.825(8) and 2Vmeas = 60(10)°; radekškodaite-(Ce): α = 1.798(6), β = 1.806(6), γ = 1.833(8) and 2Vmeas = 65(10)°. Chemical data [wt.%, electron-microprobe; FeO:Fe2O3 by charge balance; H2O by stochiometry; radekškodaite-(La)/radekškodaite-(Ce)] are: CaO 3.40/2.74, La2O3 27.68/22.23, Ce2O3 20.39/24.30, Pr2O3 0.94/1.48, Nd2O3 1.71/3.18, ThO2 0.23/0.24, MgO 0.85/1.04, Al2O3 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.09, H2O 1.62/1.63, –O=F –0.04/–0.04, total 99.70/99.89. The empirical formulae based on O28(OH,F)3 are: radekškodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00(Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0.15Ti0.03)Σ5.00Si7.00O28[(OH)2.91F0.09]; radekškodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99(Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00Si7.00O28[(OH)2.92F0.08]. Both minerals are monoclinic, P21/m; the unit-cell parameters [radekškodaite-(La)/radekškodaite-(Ce)] are: a = 8.9604(3)/8.9702(4), b = 5.7268(2)/5.7044(2), c = 25.1128(10)/25.1642(13) Å, β = 116.627(5)/116.766(6)°, V = 1151.98(7)/1149.68(11) Å3 and Z = 2/2. The crystal structures are solved based on single-crystal X-ray diffraction data; R = 0.0554 [radekškodaite-(La)] and 0.0769 [radekškodaite-(Ce)]. Both minerals belong to the epidote–törnebohmite polysomatic series and represent first members of ET2-type: their structure consists of regular alternating modules, one slab of the epidote (E) structure and two slabs of törnebohmite (T). The rootname radekškodaite is given in honor of the Czech mineralogist Radek Škoda (born 1979), Associate Professor at Masaryk University, Brno, Czech Republic. The suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral.

中文翻译：

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俄罗斯南乌拉尔历史 Mochalin Log REE 矿床的矿物学。第二部分。Radekškodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, and radekškodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, 两个属于绿帘石-特纳波姆多体系列的新型结构新矿物

摘要 两种新的等结构矿物 radekškodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 和 radekškodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3是在俄罗斯南乌拉尔 Mochalin Log REE 矿床的多矿物结核中发现的。Radekškodaite-(La) 与 allanite-(Ce)、allanite-(La)、bastnäsite-(Ce)、bastnäsite-(La)、ferriallanite-(Ce)、ferriallanite-(La)、ferriperbøeite-(La)、 fluorbritholite-(Ce)、törnebohmite-(Ce) 和 törnebohmite-(La)。Radekškodaite-(Ce) 与 ancylite-(Ce)、氟碳铈矿-(Ce)、氟碳铈矿-(La)、镧石-(La)、perbøeite-(Ce) 和 törnebohmite-(Ce) 相关。新矿物形成高达 0.35 × 0.75 mm [radekškodaite-(La)] 和 1 mm × 2 mm [radekškodaite-(Ce)] 的孤立无面体晶粒。两种矿物均为绿褐色，有玻璃光泽。Dcalc = 4.644 [radekškodaite-(La)] 和 4。651 [radekškodaite-(Ce)] g cm–3。两种矿物都是光学双轴 (+)；radekškodaite-(La): α = 1.790(7), β = 1.798(5), γ = 1.825(8) 和 2Vmeas = 60(10)°；radekškodaite-(Ce)：α = 1.798(6)，β = 1.806(6)，γ = 1.833(8) 和 2Vmeas = 65(10)°。化学数据 [wt.%，电子探针；FeO:Fe2O3 通过电荷平衡；H2O 化学计量法；radekškodaite-(La)/radekškodaite-(Ce)] 是：CaO 3.40/2.74、La2O3 27.68/22.23、Ce2O3 20.39/24.30、Pr2O3 0.94/1.48、Nd2O3/2.30.40/30.40、20.40.30.40.30.1.30.1.30.40 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.16,4O/4O.06-3.06/4O.06-F 99.70/99.89。基于 O28(OH,F)3 的经验公式为： radekškodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00(Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0 .15Ti0.03)Σ5.00Si7.00O28[(OH)2.91F0.09]；radekškodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99(Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00Si7.0OH 2.92F0.08]。两种矿物均为单斜晶系，P21/m；晶胞参数 [radekškodaite-(La)/radekškodaite-(Ce)] 为：a = 8.9604(3)/8.9702(4), b = 5.7268(2)/5.7044(2), c = 25.1128(10) /25.1642(13) Å, β = 116.627(5)/116.766(6)°, V = 1151.98(7)/1149.68(11) Å3 和 Z = 2/2。基于单晶X射线衍射数据解析晶体结构；R = 0.0554 [radekškodaite-(La)] 和 0.0769 [radekškodaite-(Ce)]。这两种矿物都属于绿帘石-绿帘石多晶系列，代表了 ET2 型的第一批成员：它们的结构由规则的交替模块、一个绿帘石 (E) 结构板片和两片绿帘石 (T) 板组成。词根 radekškodaite 是为了纪念捷克矿物学家 Radek Škoda（生于 1979 年），捷克共和国布尔诺马萨里克大学的副教授。后缀修饰符 -(La) 或 -(Ce) 表示矿物中稀土元素中 La 或 Ce 占优势。