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Muonionalustaite, Ni3(OH)4Cl2·4H2O, a new mineral formed by terrestrial weathering of the Muonionalusta iron (IVA) meteorite, Pajala, Norrbotten, Sweden
GFF ( IF 1 ) Pub Date : 2021-02-02 , DOI: 10.1080/11035897.2020.1858342
Dan Holtstam 1 , Luca Bindi 2 , Andreas Karlsson 1 , Johan Söderhielm 3 , Anders Zetterqvist 4
Affiliation  

ABSTRACT

Muonionalustaite, ideally Ni3(OH)4Cl2 · 4H2O, is a new mineral species (IMA 2020–010), found as a terrestrial weathering product of the Muonionalusta iron meteorite, in a fragment excavated 1.5 km NE of Lake Kitkiöjärvi in northernmost Sweden. Muonionalustaite occurs in cavities of corrosion crust, associated with taenite, goethite, maghemite, amorphous Fe-Ni oxy-hydroxides and soil mineral particles. The mineral is green in colour and transparent. It occurs as lath-like crystals up to ca. 5 μm, elongated along [010] and flattened on {001}, forming aggregates and thin crusts. The calculated density and overall refractive index are 2.67(1) g·cm−3 and 1.68, respectively. An empirical formula from point analyses is (Ni2.88Fe0.02S0.02Al0.01Si0.01)Σ2.94(OH3.73Cl2.27)Σ6.00 · 4H2O. The crystal structure was refined in the space group C2/m from powder X-ray diffraction data to RBragg = 3.55%. The monoclinic unit-cell parameters are a = 15.018(3) Å, b = 3.1490(6) Å, c = 10.502(3) Å, β = 101.535(15)º and V = 486.62(19) Å3 for Z = 2. Muonionalustaite is isostructural with the synthetic compounds Ni3(OH)3.9Cl2.1 · 4H2O and Mg3(OH)4Cl2 · 4H2O. The strongest X-ray diffraction lines are [I(%), d(Å), hkl]: 100, 10.30, 001; 67, 5.49, 201; 31, 3.868, 202; 30, 7.36, 200 and 25, 2.409, 602. Raman spectra show prominent bands at 3624, 3612, 3571 and 3507 cm−1, related to O–H-stretching vibrations of OH groups, and in the region 450–530 cm−1 representing metal–O(H) vibration modes.



中文翻译:

Muonionalustaite,Ni3(OH)4Cl2·4H2O,一种新的矿物,由地面风化的Muonionalusta铁(IVA)陨石,瑞典北博滕的Pajala

摘要

Muonionalustaite,理想的是Ni 3(OH)4 Cl 2  ·4H 2 O,是一种新的矿物种类(IMA 2020–010),被发现为Muonionalusta铁陨石的陆地风化产物,位于基特基耶尔维湖1.5公里东北方开挖的碎片中在瑞典最北端。Muonialustaite发生在腐蚀外壳的空腔中,与钛铁矿,针铁矿,磁赤铁矿,无定形的Fe-Ni羟基氧化物和土壤矿物颗粒有关。矿物是绿色的,透明的。它以板条状晶体的形式出现,直至大约。5μm,沿[010]伸长并在{001}上变平,形成聚集体和薄皮。计算出的密度和总折射率为2.67(1)g·cm -3和1.68分别。从点分析的经验式是(镍2.880.02 š 0.020.010.01Σ2.94(OH 3.732.27Σ6.00  ·4H 2 O的晶体结构在空间群被提炼Ç 2 /米从粉末X射线衍射数据至R Bragg  = 3.55%。单斜晶系晶胞参数为一个= 15.018(3)埃,b = 3.1490(6),C ^ = 10.502(3),β= 101.535(15)º和V = 486.62(19)一种3对于Z =2。Muonialustaite与合成化合物Ni 3(OH)3.9 Cl 2.1  ·4H 2 O和Mg 3(OH)4 Cl 2 ·4H 2 O具有同构结构。最强的X射线衍射线为[ I(% ),d(Å),hkl ]:100,10.30,001; 67、5.49、201;31,3.868,202; 30,7.36,200和25,2.409,6 02的拉曼光谱在3624,3612,3571和3507厘米显示显着条带-1,与OH-OH拉伸振动-基团,并且在该区域450- 530厘米-1 代表金属–O(H)振动模式。

更新日期:2021-02-02
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