Sergevanite, Na15(Ca3Mn3)(Na2Fe)Zr3Si26O72(OH)3·H2O, a new eudialyte-group mineral from the Lovozero alkaline massif, Kola Peninsula

IF 1.1 4区地球科学 Q3 MINERALOGY

Canadian Mineralogist Pub Date : 2020-07-01 DOI:10.3749/canmin.2000006

N. Chukanov, S. Aksenov, I. Pekov, D. Belakovskiy, S. A. Vozchikova, S. Britvin

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引用次数: 14

Abstract

The new eudialyte-group mineral sergevanite, ideally Na15(Ca3Mn3)(Na2Fe)Zr3Si26O72(OH)3·H2O, was discovered in highly agpaitic foyaite from the Karnasurt Mountain, Lovozero alkaline massif, Kola Peninsula, Russia. The associated minerals are microcline, albite, nepheline, arfvedsonite, aegirine, lamprophyllite, fluorapatite, steenstrupine-(Ce), ilmenite, and sphalerite. Sergevanite forms yellow to orange-yellow anhedral grains up to 1.5 mm across and the outer zones of some grains of associated eudialyte. Its luster is vitreous, and the streak is white. No cleavage is observed. The Mohs' hardness is 5. Density measured by equilibration in heavy liquids is 2.90(1) g/cm3. Calculated density is equal to 2.906 g/cm3. Sergevanite is nonpleochroic, optically uniaxial, positive, with ω = 1.604(2) and ε = 1.607(2) (λ = 589 nm). The infrared spectrum is given. The chemical composition of sergevanite is (wt.%; electron microprobe, H2O determined by HCN analysis): Na2O 13.69, K2O 1.40, CaO 7.66, La2O3 0.90, Ce2O3 1.41, Pr2O3 0.33, Nd2O3 0.64, Sm2O3 0.14, MnO 4.15, FeO 1.34, TiO2 1.19, ZrO2 10.67, HfO2 0.29, Nb2O5 1.63, SiO2 49.61, SO3 0.77, Cl 0.23, H2O 4.22, –O=Cl –0.05, total 100.22. The empirical formula (based on 25.5 Si atoms pfu, in accordance with structural data) is H14.46Na13.64K0.92Ca4.22Ce0.27La0.17Nd0.12Pr0.06Sm0.02Mn1.81Fe2+0.58Ti0.46Zr2.67Hf0.04Nb0.38Si25.5S0.30Cl0.20O81.35. The crystal structure was determined using single-crystal X-ray diffraction data. The new mineral is trigonal, space group R3, with a = 14.2179(1) Å, c = 30.3492(3) Å, V = 5313.11(7) Å3, and Z = 3. In the structure of sergevanite, Ca and Mn are ordered in the six-membered ring of octahedra (at the sites M11 and M12), and Na dominates over Fe2+ at the M2 site. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 7.12 (70) (110), 5.711 (43) (202), 4.321 (72) (205), 3.806 (39) (033), 3.551 (39) (220, 027), 3.398 (39) (313), 2.978 (95) (), 2.855 (100) (404). Sergevanite is named after the Sergevan' River, which is near the discovery locality.

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Sergevanite，Na15（Ca3Mn3）（Na2Fe）Zr3Si26O72（OH）3·H2O，来自科拉半岛Lovozero碱性地块的一种新的真透析物族矿物

在俄罗斯科拉半岛Lovozero碱性地块Karnasurt山的高含银火山岩中发现了一种新的真透析物族矿物sergevanite，最好是Na15（Ca3Mn3）（Na2Fe）Zr3Si26O72（OH）3·H2O。伴生矿物有微斜长石、钠长石、霞石、arfvedsonite、aegirine、煌斑岩、氟磷灰石、钛铁矿-（Ce）、钛铁矿和闪锌矿。Sergevanite形成直径达1.5毫米的黄色至橙黄色的反角体颗粒，以及一些相关的真透析物颗粒的外部区域。它的光泽是玻璃状的，条纹是白色的。未观察到解理。莫氏硬度为5。通过在重质液体中平衡测量的密度为2.90（1）g/cm3。计算的密度等于2.906 g/cm3。Sergevanite是非相变的，光学单轴，正，ω=1.604（2）和ε=1.607（2）（λ=589 nm）。给出了红外光谱。硅镁石的化学成分为（wt.%；电子探针，通过HCN分析测定H2O）：Na2O 13.69，K2O 1.40，CaO 7.66，La2O3 0.90，Ce2O3 1.41，Pr2O3 0.33，Nd2O3 0.64，Sm2O3 0.14，MnO 4.15，FeO 1.34，TiO2 1.19，ZrO2 10.67，HfO2 0.29，Nb2O5 1.63，SiO2 49.61，SO3 0.77，Cl 0.23，H2O 4.22，-O=Cl–0.05，总计100.22。经验公式（基于25.5个Si原子pfu，根据结构数据）为H14.46Na13.64K0.92Ca4.2Ce0.27La0.17Nd0.12Pr0.06Sm0.02Mn1.81Fe2+0.58Ti0.46Zr2.67Hf0.04Nb0.38Si25.5S0.30Cl0.20O81.35。使用单晶X射线衍射数据来确定晶体结构。新矿物是三角的，空间群R3，a=14.2179（1）Å，c=30.3492（3）Å、V=5531.11（7）Å3和Z=3。在sergevanite的结构中，Ca和Mn在八面体的六元环中（在位置M11和M12）是有序的，并且Na在M2位置上比Fe2+占主导地位。粉末X射线衍射图的最强谱线[d，Å（I，%）（hkl）]为：7.12（70）（110），5.711（43）（202），4.321（72）（205），3.806（39）（033），3.551（39），22027），3.398（39））（313），2.978（95）（），2.855（100）（404）。Sergevanite是以Sergevan河命名的，该河位于发现地附近。

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来源期刊

Canadian Mineralogist 地学-矿物学

CiteScore

2.20

自引率

22.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Since 1962, The Canadian Mineralogist has published papers dealing with all aspects of mineralogy, crystallography, petrology, economic geology, geochemistry, and applied mineralogy.