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Tetrahedrite-(Hg), a new ‘old’ member of the tetrahedrite group
Mineralogical Magazine ( IF 2.8 ) Pub Date : 2020-05-04 , DOI: 10.1180/mgm.2020.36
Cristian Biagioni , Jiří Sejkora , Silvia Musetti , Dalibor Velebil , Marco Pasero

Tetrahedrite-(Hg), Cu6(Cu4Hg2)Sb4S13, has been approved as a new mineral species using samples from Buca della Vena mine (hereafter BdV), Italy, Jedová hora (Jh), Czech Republic and Rožňava (R), Slovakia. It occurs as anhedral grains or as tetrahedral crystals, black in colour, with metallic lustre. At BdV it is associated with cinnabar and chalcostibite in dolomite veins. At Jh, tetrahedrite-(Hg) is associated with baryte and chalcopyrite in quartz–siderite–dolomite veins; at R it is associated with quartz in siderite–quartz veins. Tetrahedrite-(Hg) is isotropic, greyish-white in colour, with creamy tints. Minimum and maximum reflectance data for Commission on Ore Mineralogy wavelengths in air (BdV sample), R in %) are 32.5 at 420 nm; 32.9 at 546 nm; 33.2 at 589 nm; and 30.9 at 650 nm. Chemical formulae of the samples studied, recalculated on the basis of 4 (As + Sb + Bi) atoms per formula unit, are: (Cu9.44Ag0.07)Σ9.51(Hg1.64Zn0.36Fe0.06)Σ2.06Sb4(S12.69Se0.01)Σ12.70 (BdV), Cu9.69(Hg1.75Fe0.25Zn0.06)Σ2.06(Sb3.94As0.06)S12.87 (Jh) and (Cu9.76Ag0.04) Σ9.80(Hg1.83Fe0.15Zn0.10)Σ2.08(Sb3.17As0.58Bi0.25)S13.01 (R). Tetrahedrite-(Hg) is cubic, I $\overline 4 $ 3m, with a = 10.5057(8) Å, V = 1159.5(3) Å3 and Z = 2 (BdV). Unit-cell parameters for the other two samples are a = 10.4939(1) Å and V = 1155.61(5) Å3 (Jh) and a = 10.4725(1) Å and V = 1148.55(6) Å3 (R). The crystal structure of tetrahedrite-(Hg) has been refined by single-crystal X-ray diffraction data to a final R1 = 0.019 on the basis of 335 reflections with Fo > 4σ(Fo) and 20 refined parameters. Tetrahedrite-(Hg) is isotypic with other members of the tetrahedrite group. Mercury is hosted at the tetrahedrally coordinated M(1) site, along with minor Zn and Fe. The occurrence of Hg at this position agrees both with the relatively large M(1)–S(1) bond distance (2.393 Å) and the refined site scattering. Previous occurrences of Hg-rich tetrahedrite and tetrahedrite-(Hg) are reviewed, and its relations with other Hg sulfosalts are discussed.



中文翻译:

四面体-(Hg),四面体组的新“旧”成员

四面体-(Hg),Cu 6(Cu 4 Hg 2)Sb 4 S 13使用来自意大利的Buca della Vena矿(以下称BdV),捷克的Jedováhora(Jh)和斯洛伐克的Rožňava(R)的样品已被批准为新型矿物。它以无色面状或四面体晶体的形式出现,呈黑色,带有金属光泽。在BdV中,它与白云石脉中的朱砂和辉石岩相关。在Jh,四面体-(Hg)与石英-菱铁矿-白云岩脉中的重晶石和黄铜矿相关。在R处,它与菱铁矿-石英脉中的石英有关。四面体-(Hg)是各向同性的,灰白色,具有乳白色的色调。空气中矿石矿物学波长委员会的最小和最大反射率数据(BdV样品),R在420 nm时为32.5; 546 nm下为32.9; 589 nm时为33.2; 在650nm处为30.9。所研究的样品的化学式中,重新计算的基础上4(如+ SB + Bi)的每单位配方,原子是:(铜9.440.07Σ9.51(汞柱1.640.360.06Σ2.064( S 12.69 Se 0.01Σ12.70(BdV),Cu 9.69(Hg 1.75 Fe 0.25 Zn 0.06Σ2.06(Sb 3.94 As 0.06)S 12.87(Jh)和(Cu 9.76Ag 0.04Σ9.80(Hg 1.83 Fe 0.15 Zn 0.10Σ2.08(Sb 3.17 As 0.58 Bi 0.25)S 13.01(R)。Tetrahedrite-(汞柱)是立方的, $ \划线4 $ 3,用一个= 10.5057(8)A,V = 1159.5(3)3ž = 2(BDV)。对于其它两个样品晶胞参数为一个= 10.4939(1)a和V = 1155.61(5)3(JH)和一个= 10.4725(1)和V = 1148.55(6)3(R)。四面体-(Hg)的晶体结构已通过单晶X射线衍射数据在F o >4σ(F o)的335次反射和20个精炼参数的基础上精炼为最终R 1 = 0.019 。四面体-(Hg)与四面体组的其他成员同型。汞与微量的Zn和Fe一起存在于四面体配位的M(1)位置。汞在此位置的出现与相对较大的M一致(1)–S(1)的键距(2.393Å)和精细的位点散射。对富汞四面体和四面体-(Hg)的先前发生情况进行了回顾,并讨论了其与其他汞亚硫酸盐的关系。

更新日期:2020-05-04
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