Eleomelanite， (K2Pb)Cu4O2(SO4)4:俄罗斯堪察加Tolbachik火山的一种新矿物

IF 1.1 4区地球科学 Q3 MINERALOGY

Canadian Mineralogist Pub Date : 2020-11-24 DOI:10.3749/canmin.2000032

I. Pekov, N. Zubkova, A. Agakhanov, N. Chukanov, D. I. Belakovskiy, E. Sidorov, S. Britvin, A. Turchkova, D. Pushcharovsky

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引用次数: 1

摘要

在俄罗斯堪察加托尔巴切克火山大托尔巴切克裂缝北突第二火山锥的Arsenatnaya火山喷发孔中发现了一种新矿物(K2Pb)Cu4O2(SO4)4。它与氯气、铁云母、乌云母、辉蓝矿、白云石、德云母、hermanjahnite、alumok柳斑钛矿、k柳斑钛矿、闪铜矿、隐铜矿、铯钇矿、菱辉石、菱辉石、钾辉石、铁辉石、硬石膏、赤铁矿、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石、钾辉石和金有关。铁榴辉石形成宽达6毫米、厚达0.3毫米的间断结壳，由等长、棱柱状或板状晶体或厚达0.3毫米的颗粒组成。它是半透明的，黑色的。水晶表面的光泽是油质的，而切割表面的光泽是玻璃状的。Dcalc为3.790 g/cm3。Eleomelanite为双轴(-)，α 1.646(3)， β 1.715(6)， γ 1.734(6)， 2Vmeas。= 60°(15)。化学成分(wt.%，电子探针)为K2O 9.62, Rb2O 0.49, Cs2O 0.24, CaO 1.23, CuO 35.28, PbO 19.25, SO3 34.78，总计100.89。基于18 O apfu计算的经验公式为(K1.88Pb0.79Ca0.20Rb0.05Cs0.02)Σ2.94Cu4.07S3.99O18。Eleomelanite为单斜晶，P21/n, a 9.3986(3)， b 4.8911(1)， c 18.2293(5) Å， β 104.409(3)°，V 811.63(4) Å3, Z = 2。粉末XRD谱图的最强反射[d，Å(I)(hkl)]分别为:7.38(44)(101)，3.699(78)(112)，3.173(40)(211)，2.915(35)(114)，2.838(35)(204)，和。采用单晶XRD数据求解晶体结构，R1 = 4.78%。它是基于Cu-S-O杂多面体链，由[4+1+1]Cu2+配位的cu中心多面体和SO4四面体组成。相邻的Cu-S-O链通过(K,Pb)O8和KO10多面体链连接。Eleomelanite是一种新型的结构类型，但与克柳切夫钛矿、铝柳切夫钛矿、乌云母、副乌云母、滑石等具有共同的结构特征。它的名字来源于希腊语ελαιν (eleon)(油)和μλας (melas)(黑色)(黑色)，因为它的颜色是黑色的，在硫酸盐矿物中不常见的晶体表面有油质光泽。

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Eleomelanite, (K2Pb)Cu4O2(SO4)4, a new mineral species from the Tolbachik Volcano, Kamchatka, Russia

The new mineral eleomelanite, (K2Pb)Cu4O2(SO4)4, was found in the Arsenatnaya fumarole on the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik Volcano, Kamchatka, Russia. It is associated with euchlorine, fedotovite, wulffite, chalcocyanite, dolerophanite, dravertite, hermannjahnite, alumoklyuchevskite, klyuchevskite, piypite, cryptochalcite, cesiodymite, anglesite, langbeinite, calciolangbeinite, metathénardite, belomarinaite, aphthitalite, krasheninnikovite, steklite, anhydrite, hematite, tenorite, sanidine, sylvite, halite, lammerite, urusovite, and gold. Eleomelanite occurs as interrupted crusts up to 6 mm across and up to 0.3 mm thick consisting of equant, prismatic, or tabular crystals or grains up to 0.3 mm. It is translucent and black. The luster is oleaginous on crystal faces and vitreous on a cleavage surface. Dcalc is 3.790 g/cm3. Eleomelanite is optically biaxial (–), α 1.646(3), β 1.715(6), γ 1.734(6), 2Vmeas. = 60(15)°. The chemical composition (wt.%, electron-microprobe) is K2O 9.62, Rb2O 0.49, Cs2O 0.24, CaO 1.23, CuO 35.28, PbO 19.25, SO3 34.78, total 100.89. The empirical formula calculated based on 18 O apfu is (K1.88Pb0.79Ca0.20Rb0.05Cs0.02)Σ2.94Cu4.07S3.99O18. Eleomelanite is monoclinic, P21/n, a 9.3986(3), b 4.8911(1), c 18.2293(5) Å, β 104.409(3)°, V 811.63(4) Å3, and Z = 2. The strongest reflections of the powder XRD pattern [d,Å(I)(hkl)] are: 7.38(44)(101), 3.699(78)(112), , 3.173(40)(211), 2.915(35)(114), 2.838(35)(204), , and . The crystal structure was solved using single-crystal XRD data, R1 = 4.78%. It is based on heteropolyhedral Cu–S–O chains composed of Cu-centered polyhedra with [4+1+1] Cu2+ coordination and SO4 tetrahedra. Adjacent Cu–S–O chains are connected via chains of (K,Pb)O8 and KO10 polyhedra. Eleomelanite belongs to a novel structure type but has common structural features with klyuchevskite, alumoklyuchevskite, wulffite, parawulffite, and piypite. The name is derived from the Greek ελαιν (eleon), oil, and μλας (melas), black, due to its black color and oleaginous luster on crystal faces that are uncommon for sulfate minerals.

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来源期刊

Canadian Mineralogist 地学-矿物学

CiteScore

2.20

自引率

22.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Since 1962, The Canadian Mineralogist has published papers dealing with all aspects of mineralogy, crystallography, petrology, economic geology, geochemistry, and applied mineralogy.