Kalyuzhnyite-(Ce), NaKCaSrCeTi(Si8O21)OF(H2O)3, a new mineral from the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan: mineral description, crystal structure and a new double (Si8O21) sheet

IF 2.8 3区地球科学 Q2 MINERALOGY

Mineralogical Magazine Pub Date : 2023-10-13 DOI:10.1180/mgm.2023.74

Atali A. Agakhanov, Elena Sokolova, Vladimir Yu. Karpenko, Frank C. Hawthorne, Leonid A. Pautov, Anatoly V. Kasatkin, Igor V. Pekov, Vitaliya A. Agakhanova

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Abstract

Kalyuzhnyite-(Ce), ideally NaKCaSrCeTi(Si8O21)OF(H2O)3, is a new mineral from the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan. It occurs as equant grains up to 0.05 × 0.07 mm in a quartz–pectolite aggregate in a silexite-like peralkaline pegmatite. Associated minerals are quartz, fluorite, pectolite, baratovite, aegirine, leucosphenite, neptunite, reedmergnerite, orlovite, sokolovaite, mendeleevite-(Ce), odigitriaite, pekovite, zeravshanite, kirchhoffite and garmite. The mineral is colourless with a vitreous lustre and a white streak, and Dcalc. is 3.120 g/cm3. Kalyuzhnyite-(Ce) is monoclinic, P2/c, a = 18.647(4), b = 11.214(2), c = 14.642(3) Å, β = 129.55(3)° and V = 2360.9(11) Å3. The chemical composition of kalyuzhnyite-(Ce) is Nb2O5 0.53, TiO2 0.16, SiO2 43.85, Er2O3 0.13, Ho2O3 0.10, Gd2O3 0.09, Sm2O3 0.47, Nd2O3 6.22, Pr2O3 1.21, Ce2O3 6.34, La2O3 0.82, PbO 4.90, BaO 0.85, SrO 11.39, CaO 1.86, Cs2O 3.80, K2O 1.59, Na2O 2.99, H2O 5.24, F 1.55, O = F –0.65, total 100.31 wt.%. The empirical formula calculated on 26.11 (O + F) apfu is Na1.07K0.37Cs0.30Sr1.21Ca0.37Pb0.24Ba0.06(Ce0.43Nd0.41Pr0.08La0.06Sm0.03Gd0.01Er0.01Ho0.01)Σ1.04(Ti0.97Nb0.04)Σ1.01Si8.06O25.21F0.90H6.42, Z = 4. The simplified formula is (Na,□)(K,Сs)(Ca,Pb,Sr,Na)SrLn3+Ti(Si8O21)OF(H2O)3, where Ce is the dominant lanthanoid. The crystal structure was solved by direct methods and refined to an R1 index of 2.74%. In kalyuzhnyite-(Ce), the main structural units are a heteropolyhedral Na–Sr–Ce–Ti sheet, ideally [NaSrCeTiOF]7+, and a double (Si8O21)10– sheet parallel to (010). In the Si–O sheet, the Si tetrahedra form ten-membered rings. This is the first occurrence of such a double Si–O sheet in a mineral. The two sheets connect via common vertices of Na-, Sr-, Ce- and Ti-polyhedra and SiO4 tetrahedra to form a framework. The interstitial cations and H2O groups, ideally [(CaK)(H2O)3]3+, occur within the Si–O sheet. The mineral is named in honour of Vasily Avksentievich Kalyuzhny (1899–1993) in recognition of his contributions to the geology of ore deposits of Komi Republic (USSR) and the mineralogy of granitic pegmatites (Tajikistan).

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塔吉克斯坦天山Darai-Pioz碱性丘陵的新矿物Kalyuzhnyite-(Ce)，NaKCaSrCeTi(Si8O21)OF(H2O)3：矿物描述、晶体结构和新的双(Si8O21)薄片

Kalyuzhnyite-(Ce)，理想状态为 NaKCaSrCeTi(Si8O21)OF(H2O)3，是一种产自塔吉克斯坦天山Darai-Pioz碱性地块的新矿物。它以最大 0.05 × 0.07 毫米的等粒形式出现在石英-埃洛石集合体中，位于一个类似围岩的伟晶岩中。伴生矿物有石英、萤石、pectolite、baratovite、aegirine、leucosphenite、neptunite、reedmergnerite、orlovite、sokolovaite、mendeleevite-(Ce)、odigitriaite、pekovite、zeravshanite、kirchhoffite 和 garmite。该矿物无色，具有玻璃光泽和白色条纹，密度为 3.120 克/立方厘米。Kalyuzhnyite-(Ce)呈单斜，P2/c，a = 18.647(4)，b = 11.214(2)，c = 14.642(3)埃，β = 129.55(3)°，V = 2360.9(11)埃3。kalyuzhnyite-(Ce)的化学成分为 Nb2O5 0.53、TiO2 0.16、SiO2 43.85、Er2O3 0.13、Ho2O3 0.10、Gd2O3 0.09、Sm2O3 0.47、Nd2O3 6.22、Pr2O3 1.21, Ce2O3 6.34, La2O3 0.82, PbO 4.90, BaO 0.85, SrO 11.39, CaO 1.86, Cs2O 3.80, K2O 1.59, Na2O 2.99, H2O 5.24, F 1.55, O = F -0.65, 总计 100.31 wt.%。根据 26.11 (O + F) apfu 计算得出的经验公式为 Na1.07K0.37Cs0.30Sr1.21Ca0.37Pb0.24Ba0.06(Ce0.43Nd0.41Pr0.08La0.06Sm0.03Gd0.01Er0.01Ho0.01)Σ1.04(Ti0.97Nb0.04)Σ1.01Si8.06O25.21F0.90H6.42, Z = 4.简化公式为 (Na,□)(K,Сs)(Ca,Pb,Sr,Na)SrLn3+Ti(Si8O21)OF(H2O)3，其中 Ce 是主要的镧系元素。该晶体结构是通过直接方法求解的，其 R1 指数为 2.74%。在 kalyuzhnyite-(Ce)中，主要的结构单元是异多面体 Na-Sr-Ce-Ti 片（理想状态为 [NaSrCeTiOF]7+）和平行于 (010) 的双 (Si8O21)10- 片。在 Si-O 片层中，Si 四面体形成十元环。这是矿物中首次出现这种双 Si-O 片层。两个薄片通过 Na-、Sr-、Ce- 和 Ti- 多面体以及 SiO4 四面体的共同顶点连接起来，形成一个框架。间隙阳离子和 H2O 基团（理想情况下为[(CaK)(H2O)3]3+）出现在 Si-O 片层中。该矿物以 Vasily Avksentievich Kalyuzhny（1899-1993 年）命名，以表彰他对苏联科米共和国矿床地质学和塔吉克斯坦花岗伟晶岩矿物学的贡献。

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来源期刊

Mineralogical Magazine 地学-矿物学

CiteScore

4.00

自引率

25.90%

发文量

104

审稿时长

6-12 weeks

期刊介绍： Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.