卡勒莱石(Ca2MnO4)--来自德国贝勒贝格火山的第一种具有 Ruddlesden-Popper 类型结构的矿物

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Juroszek Rafał, Krüger Biljana, Cametti Georgia, Ternes Bernd, Blaβ Günter
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引用次数: 0

摘要

卡尔勒石(理想状态下为 Ca2MnO4)是一种新近获得批准的附属矿物,发现于德国埃菲尔贝勒贝格火山卡斯帕采石场玄武熔岩的异岩石样本中。它通常呈薄片状/板状晶体,直径在 40 到 80 μm 之间,与过闪长岩超群的其他成员(如srebrodolskite、brownmillerite、sharyginite、perovskite 和 lakargiite)伴生,分布在以reinhardbraunsite、fluorellestadite、fluorapatite、larnite、gehlenite 和几种水合钙铝硅酸盐为代表的成岩矿物中。卡尔勒石晶体为棕色,具有亚金属光泽、浅棕色条纹和良好的沿 (001) 裂纹。它无荧光,质脆,断口不均匀,莫氏硬度为 3.5,计算密度 Dx = 3.79 克/立方厘米。根据每个式子中的 O = 4 个原子计算得出的整体型卡勒莱石的经验公式为 (Ca1.97Ce3+0.06)2.03(Mn4 + 0.39Ti0.36Fe3+0.19Al0.09)1.03O4 ,这表明它是一种多组分相,其特征是八面体部位存在各种取代基。卡尔勒石为四方 I4/mmm(编号 139),a = 3.7683(2)埃,c = 11.9893(8)埃,V = 170.254(17)埃3,Z = 2。X 射线粉末衍射图样中计算出的最强线是 [d in Å (I) hkl]:5.995 (43), 2.742 (100), 2.665 (91), 2.023 (25), 1.998 (28), 1.884 (61), 1.553 (38), 1.371 (24).这种新矿物是第一种呈现一阶 Ruddlesden-Popper 型结构的天然相,表明其具有模块化性质,由 Ca(Mn、Ti、Fe、Al)O3 包晶层组成,包在沿 c 轴排列的 CaO 岩盐层之间。拉曼光谱支持对化学和结构数据的解释。矿物关联、结构数据以及对合成 Ca-Mn-O 系统的研究表明,卡勒莱石可能在 1000˚C 以上的高温条件下形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Karlleuite Ca2MnO4 – a first mineral with the Ruddlesden-Popper type structure from Bellerberg volcano, Germany

Karlleuite Ca2MnO4 – a first mineral with the Ruddlesden-Popper type structure from Bellerberg volcano, Germany

Karlleuite, ideally Ca2MnO4, is a newly approved accessory mineral found in the xenolith sample within the basaltic lava from the Caspar quarry, Bellerberg volcano, Eifel, Germany. It usually occurs as thin tabular/plate crystals, which range from 40 to 80 μm in diameter, and is associated with other members of the perovskite supergroup such as srebrodolskite, brownmillerite, sharyginite, perovskite, and lakargiite distributed within rock-forming minerals represented by reinhardbraunsite, fluorellestadite, fluorapatite, larnite, gehlenite, and several hydrated Ca aluminosilicates. Karlleuite crystals are brown with sub-metallic lustre, a light brown streak, and a good cleavage along (001). It is non-fluorescent, brittle and has an uneven fracture, a Mohs hardness of 3.5 and calculated density Dx = 3.79 g/cm3. The empirical formula of the holotype karlleuite calculated based on O = 4 atoms per formula is (Ca1.97Ce3+0.06)2.03(Mn4 +0.39Ti0.36Fe3+0.19Al0.09)1.03O4, which shows that it is a multicomponent phase characterised by various substituents at the octahedral site. Karlleuite is tetragonal I4/mmm (no. 139), with a = 3.7683(2) Å, c = 11.9893(8) Å, V = 170.254(17) Å3, and Z = 2. The calculated strongest lines in the X-ray powder diffraction pattern are [d in Å (I) hkl]: 5.995 (43), 2.742 (100), 2.665 (91), 2.023 (25), 1.998 (28), 1.884 (61), 1.553 (38), 1.371 (24). The new mineral is the first natural phase which exhibits a first order of Ruddlesden-Popper type structure, which indicates a modular nature and consists of Ca(Mn, Ti, Fe, Al)O3 perovskite layers, packed between CaO rock-salt layers arranged along the c-axis. Raman spectroscopy supports the interpretation of the chemical and structural data. Mineral association, structural data, as well as the study of the synthetic Ca-Mn-O system suggest that karlleuite could form under high-temperature conditions, above 1000˚C.

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来源期刊
Mineralogy and Petrology
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
0
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.
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