Stibioústalečite, Cu6Cu6(Sb2Te2)Se13, the first Te-Se member of tetrahedrite group, from the Ústaleč, Czech Republic

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geosciences Pub Date : 2022-12-14 DOI:10.3190/jgeosci.359

J. Sejkora, J. Plášil, E. Makovicky

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引用次数: 1

Abstract

Stibioústalečite , Cu 12 (Sb 2 Te 2 )Se 13 , was approved as a new mineral species from the Ústaleč mine, 15 km west of Horažďovice, SW Bohemia, Czech Republic. It occurs as metallic anhedral grains up to 0.1–0.3 mm in size, dark grey in color, in a calcite gangue. It is directly associated with hakite-(Hg), berzelianite, the not-yet approved phase Cu 12 (As 2 Te 2 ) Se 13 and uraninite. Stibioústalečite is brittle, with an indistinct cleavage and a conchoidal fracture; the calculated density is 5.676 g/cm 3 . In reflected light, stibioústalečite is isotropic, and grey in color; internal reflections were not observed. Reflectance data for the four COM wavelengths in air are [λ (nm): R (%)]: 470: 33.3; 546: 33.2; 589: 33.1; 650: 33.0. Electron microprobe analysis for holotype material (grain used for single-crystal X-ray study) gave (in wt. % – average of 7 spot analyses): Cu 34.10, Ag 1.22, Fe 0.04, Zn 0.09, Hg 0.33, Sb 9.39, As 0.70, Te 12.41, S 3.76, Se 37.59, total 99.63. On the basis of (As + Sb + Te) = 4 atoms per formula unit ( apfu ), the empirical formula of stibioústalečite is M (2) (Cu 5.75 Ag 0.25 ) Σ6 M (1) (Cu 5.93 Hg 0.04 Zn 0.03 Fe 0.02 ) Σ6.02 X (3) (Te 2.12 Sb 1.68 As 0.20 ) Σ4 (Se 10.36 S 2.55 ) Σ12.91 . The ideal formula is Cu 6 Cu 6 (Sb 2 Te 2 ) Se 13 , which requires Cu 33.33, Sb 10.64 Te 11.16 Se 44.87, total 100 wt. %. Stibioústalečite is cubic, I 4̄ 3 m , with unit-cell parameters a = 10.828(4) Å, V = 1269.6(9) Å 3 , Z = 2. The crystal structure of stibioústalečite was studied by singlecrystal X-ray diffraction data and it is isotypic with other members of the tetrahedrite group. The mineral is named after its type locality Ústaleč and its chemical composition, being the (Sb/Te) end-member in the possible ústalečite series.

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Stibioústalečite，Cu6Cu6（Sb2Te2）Se13，四面体群的第一个Te-Se成员，来自捷克的Ústalećite

Stibioústalečite, Cu 12 (Sb 2 Te 2)Se 13，是在捷克波希米亚西南部Horažďovice以西15 km处的Ústaleč矿区发现的一种新矿物。在方解石脉石中以金属四面体颗粒的形式出现，大小可达0.1-0.3毫米，颜色为深灰色。它与hakite-(Hg)、白绿石、尚未批准的Cu 12 (As 2 Te 2) Se 13和铀矿直接相关。Stibioústalečite脆性，有不明显的解理和贝壳状断裂;计算密度为5.676 g/ cm3。在反射光中，stibioústalečite是各向同性的，呈灰色;没有观察到内部反射。四个COM波长在空气中的反射率数据为[λ (nm): R (%)]: 470: 33.3;546: 33.2;589: 33.1;650: 33.0。纯型材料(用于单晶x射线研究的颗粒)的电子探针分析(wt % -平均7点分析):Cu 34.10, Ag 1.22, Fe 0.04, Zn 0.09, Hg 0.33, Sb 9.39, As 0.70, Te 12.41, S 3.76, Se 37.59，总计99.63。根据(As + Sb + Te) = 4个原子/分子式单位(apfu)， stibioústalečite的经验公式为M (2) (Cu 5.75 Ag 0.25) Σ6 M (1) (Cu 5.93 Hg 0.04 Zn 0.03 Fe 0.02) Σ6.02 X (3) (Te 2.12 Sb 1.68 As 0.20) Σ4 (Se 10.36 S 2.55) Σ12.91。理想的配方为Cu 6 Cu 6 (Sb 2 Te 2) Se 13，需要Cu 33.33, Sb 10.64, Te 11.16, Se 44.87，总量为100 wt. %。Stibioústalečite为立方，I 4 × 3 m，单位胞参数a = 10.828(4) Å， V = 1269.6(9) Å 3, Z = 2。通过单晶x射线衍射数据研究了stibioústalečite的晶体结构，发现其与四面体族的其他成员具有同型性。该矿物以其类型位置Ústaleč和化学成分命名，是可能的ústalečite系列中的(Sb/Te)端元。

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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.