Mckelveyite group minerals – Part 2: Alicewilsonite-(YCe), Na2Sr2YCe(CO3)6 ⋅ 3H2O, a new species

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2023-02-28 DOI:10.5194/ejm-35-143-2023

I. Lykova, R. Rowe, G. Poirier, H. Friis, K. Helwig

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引用次数: 1

Abstract

Abstract. The new mckelveyite group mineral alicewilsonite-(YCe), ideally Na2Sr2YCe(CO3)6 ⋅ 3H2O, was found at Mont Saint-Hilaire, Quebec, Canada, and subsequently at the Saint-Amable sill, Quebec, Canada, and the Khibiny Massif, Kola Peninsula, Russia. Alicewilsonite-(YCe) crystals are commonly hemimorphic pseudotrigonal and pseudohexagonal and show barrel-shaped, saucer-shaped, spindle-shaped, cone-shaped, columnar, tabular, and platy habits. They are usually up to 2–3 mm in size with some larger crystals reaching 2–3 cm. The crystals often form stacked or parallel growth aggregates and rosettes. Alicewilsonite-(YCe) colour varies from pale yellow to yellow, lemon yellow, green yellow, orange-yellow, pale green to green, pale grey to grey, green grey, beige, and colourless. The streak is white; the lustre is vitreous. The cleavage is fair to indistinct, parallel to (001). The Mohs hardness is 3. Dcalc is 3.37 g cm−3. Alicewilsonite-(YCe) is optically biaxial (+), with α=1.554(3), β=1.558(3), γ=1.644(2), 2V (calc.) = 26∘, 2V (meas.) = 20(3)∘ (589 nm). The IR spectrum is reported. The composition (wt %, average of six analyses) is Na2O 7.42, CaO 0.72, SrO 21.49, BaO 1.41, Y2O3 8.52, La2O3 5.93, Ce2O3 9.52, Pr2O3 0.59, Nd2O3 1.75, Sm2O3 0.46, Gd2O3 0.83, Dy2O3 1.65, Ho2O3 0.34, Er2O3 1.21, Yb2O3 0.64, CO2 29.33, H2O 6.13, total 97.94. The empirical formula of the holotype calculated on the basis of six cations is Na2.11Ca0.11Sr1.83Ba0.08Y0.67(Ce0.51La0.32Pr0.03Nd0.09Sm0.02Gd0.04 Dy0.08Ho0.02Er0.06Yb0.03)Σ1.20(CO3)5.88 (H2O)3.00. The mineral is triclinic, P1, a=9.0036(6) Å, b=9.0175(6) Å, c=6.7712(5) Å, α=102.724(2)∘, β=116.398(2)∘, γ=60.003(2)∘, V=426.46(5) Å3, and Z=1. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are 6.07(31)(001), 4.372(100)(120, 2‾1‾1, 11‾0), 4.037(25)(1‾11, 1‾2‾1, 210), 3.201(25)(121, 2‾1‾2, 11‾1), 2.831(67)(1‾12, 1‾2‾2, 211, 1‾21, 21‾0), 2.601(39)(030, 3‾3‾1,3‾01), 2.236(24)(2‾4‾1, 2‾21, 4‾2‾1). 2.019(23)(003, 2‾22, 2‾4‾2‾, 420). 1.9742(24)(032, 3‾03, 3‾3‾3, 331, 03‾2, 301). The crystal structure, solved and refined from single-crystal X-ray diffraction data (R1=0.055), is of the weloganite type.

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摘要新的mckelveyite族矿物alicewilsonite-（YCe），理想情况下为Na2Sr2YCe（CO3）6 ⋅ 3H2O，在加拿大魁北克省的圣希莱尔山发现，随后在加拿大魁北克的圣阿马布尔希尔和俄罗斯科拉半岛的基比尼地块发现。Alicewisonite-（YCe）晶体通常为半形假三角和准六边形，表现出桶形、碟形、纺锤形、锥形、柱状、板状和板状的习性。它们通常高达2-3 毫米，一些较大的晶体达到2–3 晶体通常形成堆叠或平行生长的聚集体和玫瑰花结。Alicewisonite（YCe）的颜色从浅黄色到黄色、柠檬黄色、绿黄色、橙黄色、浅绿色到绿色、浅灰色到灰色、绿灰色、米色和无色不等。条纹是白色的；光泽是玻璃状的。解理一般到模糊，平行于（001）。莫氏硬度是3。Dcalc为3.37 g cm−3。Alicewisonite-（YCe）为光学双轴（+），α=1.554（3），β=1.558（3）、γ=1.644（2），2V（计算值） = 26∘，2V（测量值） = 20（3）∘（589 nm）的红外光谱。成分（wt %, 六次分析的平均值）为Na2O 7.42、CaO 0.72、SrO 21.49、BaO 1.41、Y2O3 8.52、La2O3 5.93、Ce2O3 9.52、Pr2O3 0.59、Nd2O3 1.75、Sm2O3 0.46、Gd2O3 0.83、Dy2O3 1.65、Ho2O3 0.34、Er2O3 1.21、Yb2O3 0.64、CO229.33、H2O 6.13，总计97.94。基于六种阳离子计算的全息图经验公式为Na2.11Ca.11Sr1.83Ba.08Y0.67（Ce0.51La0.32Pr0.03Nd0.09Sm0.02Gd0.04Dy0.08Ho0.02Er0.06Yb0.03）∑1.20（CO3）5.88 6（5）Å3和Z=1。粉末X射线衍射图[d，Å（I）（hkl）]的强反射为6.07（31）（001），4.372（100）（120，2‾4; 21，21‾0），2.601（39）（030，3 \8254\3‿1，3‖01），2.236（24）（2𔉰4 \8254；1，2‼2※1）。2.019（23）（003,2,2,2,4,20）。1.9742（24）。从单晶X射线衍射数据（R1=0.055）中解析和细化得到的晶体结构为辉长岩型。

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.