Orishchinite, a new terrestrial phosphide, the Ni-dominant analogue of allabogdanite

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Mineralogy and Petrology Pub Date : 2022-07-12 DOI:10.1007/s00710-022-00787-x

Sergey N. Britvin, Mikhail N. Murashko, Yevgeny Vapnik, Anatoly N. Zaitsev, Vladimir V. Shilovskikh, Maria G. Krzhizhanovskaya, Liudmila A. Gorelova, Oleg S. Vereshchagin, Evgeny A. Vasilev, Natalia S. Vlasenko

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引用次数: 1

Abstract

Orishchinite is a new terrestrial phosphide discovered in pyrometamorphic rocks of the Daba-Siwaqa combustion complex in West Jordan. The mineral occurs as an accessory phase in the fused clinopyroxene-plagioclase rock (paralava) texturally resembling gabbro-dolerite. Orishchinite forms resorbed equant grains up to 0.2 mm outrimmed with 0.1–0.2 thick zones of substituting murashkoite, FeP. Chemical composition (electron microprobe, wt%): Ni 38.49, Fe 22.38, Co 0.47, Mo 18.80, P 19.46, Total 99.60, corresponding to the empirical formula (Ni_1.04Fe_0.64Mo_0.31Co_0.01)_Σ2.00P on the basis of 3 apfu. The simplified formula is (Ni,Fe,Mo)₂P and the ideal one is Ni₂P. Macroscopically, orishchinite grains have yellowish-white colour with metallic lustre. The mineral is brittle. In reflected light, orishchinite is yellowish-white and non-pleochroic. It is very weakly anisotropic (ΔR₅₈₉ = 1.3%). Reflectance values for the wavelengths recommended by the Commission on Ore Mineralogy of the International Mineralogical Association are [R_max/R_min (%), λ (nm)]: 48.1/47.5, 470; 50.6/49.4, 546; 52.1/50.8, 589; 54.4/52.9.1, 650. The crystal structure was solved and refined to R₁ = 0.016 based on 224 unique observed [I ≥ 2σ(I)] reflections. Orishchinite is orthorhombic, space group Pnma, a 5.8020(7), b 3.5933(4), c 6.7558(8) Å, V 140.85(3) Å³, Z = 4, D_x = 7.695 g cm^-3. The strongest lines of the powder X-ray diffraction pattern [(d, Å) (I, %) (hkl)] are: 2.265(100)(112), 2.201(16)(202), 2.142(55)(211), 2.100(35)(103), 1.909(21)(013), 1.811(19)(113), 1.796(31)(020). Orishchinite is dimorphous with transjordanite (hexagonal Ni₂P) and can be considered the Ni-dominant analogue of allabogdanite.

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辉石，一种新的陆生磷化物，与泛长辉石类似

Orishchinite是在约旦西部Daba-Siwaqa燃烧杂岩的热变质岩中发现的一种新的陆生磷化物。该矿物在斜辉石-斜长石熔融岩(副长岩)中作为副相出现，结构上类似于辉长岩-白云岩。orishinite形成重达0.2 mm的被吸收的等量颗粒，边缘为0.1-0.2厚的替代murashkoite, FeP。化学成分(电子探针，wt%): Ni 38.49, Fe 22.38, Co 0.47, Mo 18.80, P 19.46, Total 99.60，在3 apfu的基础上对应于实验式(Ni1.04Fe0.64Mo0.31Co0.01)Σ2.00P。简化公式为(Ni,Fe,Mo)2P，理想公式为Ni2P。宏观上看，橄榄石颗粒呈黄白色，具有金属光泽。这种矿物易碎。在反射光下，橄榄石呈黄白色，无多色性。它是非常弱的各向异性(ΔR589 = 1.3%)。国际矿物学协会矿石矿物学委员会建议的波长的反射率值为[Rmax/Rmin (%)， λ (nm)]: 48.1/47.5, 470;50.6/49.4, 546;52.1/50.8, 589;54.4 / 52.9.1, 650年。基于观测到的224个独特的[I≥2σ(I)]反射，对晶体结构进行求解并细化到R1 = 0.016。Orishchinite为正交晶型，空间群Pnma, a 5.8020(7)， b 3.5933(4)， c 6.7558(8) Å， V 140.85(3) Å3, Z = 4, Dx = 7.695 g cm-3。粉末x射线衍射图的最强谱线[(d， Å) (I， %) (hkl)]分别为:2.265(100)(112)、2.201(16)(202)、2.142(55)(211)、2.100(35)(103)、1.909(21)(013)、1.811(19)(113)、1.796(31)(020)。Orishchinite与trans - jordanite(六方Ni2P)呈二态，可以认为是allabognite的镍主导类似物。

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来源期刊

Mineralogy and Petrology 地学-地球化学与地球物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered. Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.