Complementing knowledge about rare sulphates lonecreekite, NH4Fe3+(SO4)2·12 H2O and sabieite, NH4Fe3+(SO4)2: chemical composition, XRD and RAMAN spectroscopy (Libušín near Kladno, the Czech Republic)

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geosciences Pub Date : 2019-01-09 DOI:10.3190/JGEOSCI.283

V. Žáček, R. Škoda, F. Laufek, F. Košek, J. Jehlička

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引用次数: 4

Abstract

Lonecreekite and sabieite, hydrous and anhydrous ferric ammonium sulphates, were identified among the products of a long-lasting subsurface fire in the waste heap of the Schoeller coal mine in Libušín near Kladno, Central Bohemia, Czech Republic. No monomineralic fractions could be extracted as the minerals occur in a fine-grained aggregate with minor ferroan boussingaultite, tschermigite, and traces of efremovite. Powder X-ray diffraction, electron-microprobe analysis and Raman spectroscopy were used to identify the mineral phases in the mixture. The empirical formula of lonecreekite is [(NH4)0.98K0.02]∑1.00 (Fe0.70Al0.24Mg0.02)∑0.96 (SO4) 2.05·12 H2O, and the calculated unit-cell (Pa3̅ ) parameter a = 12.2442(2) Å, with a cell volume of V = 1835.68(9) Å3. The composition of sabieite corresponds to the formula [(NH4)0.98K0.02]∑1.00 (Fe0.70Al0.24Mg0.02)∑0.96 (SO4) 2.05, and the calculated unit-cell parameters (P321) are a = 4.826(1) Å, c = 8.283(2) Å, V = 167.10(8) Å3, assuming that only the 1T polytype is present. Raman spectroscopy was conducted on both minerals, giving strong Raman bands at 1037 cm–1 (ν1), 1272 cm–1 (ν3), 462 cm–1 (ν2), 643 cm–1 (ν4), 313 (M–O vibration) for sabieite; and at 991 cm–1 (ν1), 1132 and 1104 cm–1 (ν3), 461 and 443 cm–1 (ν2), and 616 cm–1 (ν4) for lonecreekite (where ν1 and ν3 are stretching modes of the (SO4)-group and ν2 and ν4 are bending modes). The sabieite most probably formed by in situ decomposition of the siderite-bearing sedimentary rock at ~115–350 °C. The lonecreekite originated through hydration of the sabieite when the sample was stored at ambient temperature. Empirical formulae of associated ferroan boussingaultite and tschermigite are also given, respectively, as (NH4)2 (Mg0.62Fe0.36Mn0.06)∑1.04 (SO4)1.97·6 H2O and [(NH4)0.98K0.02]∑1.00 (Al0.97Fe0.06)∑1.03 (SO4)2.97·12 H2O.

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关于稀有硫酸盐的补充知识，Lonecereite，NH4Fe3+（SO4）2·12 H2O和sabieite，NH4Fe3+（SO4）2:化学成分，XRD和拉曼光谱（捷克共和国克拉德诺附近的Libušín）

在捷克共和国中波希米亚州克拉德诺附近利布辛的Schoeller煤矿废料堆中，发现了Lonecereite和sabieite，即含水和无水硫酸铁铵。不能提取单矿物组分，因为矿物存在于细粒集料中，其中含有少量铁素体boussingultite、tschmergite和微量的efremovite。利用粉末X射线衍射、电子探针分析和拉曼光谱对混合物中的矿物相进行了鉴定。龙克里石的经验公式为[（NH4）0.98K0.02]∑1.00（Fe0.70Al0.24Mg0.02）∑0.96（SO4）2.05·12H2O，计算出的晶胞（Pa3õ）参数a=12.442（2）Å，晶胞体积V=1835.68（9）Å3。钠镁石的组成对应于式[（NH4）0.98K0.02]∑1.00（Fe0.70Al0.24Mg0.02）∑0.96（SO4）2.05，并且假设仅存在1T多型，计算的晶胞参数（P321）为a=4.826（1）Å，c=8.283（2）Å和V=167.10（8）Å3。对这两种矿物都进行了拉曼光谱分析，在1037 cm–1（Γ1）、1272 cm–1）（Γ3）、462 cm–1；在991 cm–1（Γ1）、1132和1104 cm–1的位置（Γ3）、461和443 cm–1和616 cm–4的位置（其中，Γ1和Γ3是（SO4）-基团的拉伸模式，Γ2和Γ4是弯曲模式）。菱铁矿很可能是由含菱铁矿的沉积岩在约115–350°C下原位分解形成的。当样品在环境温度下储存时，氯镁石是通过钠镁石的水合作用产生的。文中还给出了伴生铁素体-布锡高铁矿和铬铁矿的经验公式，分别为（NH4）2（Mg0.62Fe0.36Mn0.06）∑1.04（SO4）1.97·6H2O和[（NH3）0.98K0.02]∑1.00（Al0.97Fe0.06）σ1.03（SO4）2.97·12H2O。

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来源期刊

Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY

CiteScore

2.30

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.