Argentotetrahedrite-(Zn), Ag₆(Cu₄Zn₂)Sb₄S₁₃, a new member of the tetrahedrite group

Abstract

Argentotetrahedrite-(Zn), Ag 6 (Cu 4 Zn 2 )Sb 4 S 13 , has been approved as a new mineral species by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (CNMNC-IMA) using samples from Kremnica, Slovak Republic (hereafter KR), and Lengenbach, Switzerland (LE). Additionally, it was also identified at the small deposit of Zvěstov (Stříbrnice), Czech Republic (ZV). At the Slovak locality, it occurs as anhedral grains up to 0.1 mm in size, steel-grey in color, with a metallic luster, in association with "argentotennantite-(Fe)" and tiny chalcopyrite grains in quartz gangue. At Lengenbach, it was found as domains of tristetrahedral crystal of tetrahedrite-(Zn), up to 1 mm in size, associated with dolomite. At Zvěstov, it occurs as irregular aggregates, up to 0.2 mm in size, partly rimmed by kenoargentotetrahedrite-(Fe). Argentotetrahedrite-(Zn) is isotropic, grey in color, with blue-greenish tints. Reflectance data for COM wavelengths in air (KR sample) are [λ (nm,

Argentotetrahedrite-(Cd), Ag6(Cu4Cd2)Sb4S13, a new member of the tetrahedrite group from Rudno nad Hronom, Slovakia.

“…The positive correlation between Sb and Ag is indistinct (Fig. 4b), similarly as described for Ag-rich tetrahedrite by Johnson et al (1986) and Sejkora et al (2022). All studied samples have Cd as the dominant C-constituent (Fig.…”

“…Argentotetrahedrite-(Cd) belongs to the freibergite series within the tetrahedrite group (Table 8) (Biagioni et al, 2020a). It is the Cd-isotype of argentotetrahedrite-(Fe) (Welch et al, 2018), argentotetrahedrite-(Zn) (Sejkora et al, 2022) and argentotetrahedrite-(Hg) (Wu et al, 2021). Selected data for argentotetrahedrite-(Cd) sample and valid (Zn/Fe/Hg)-members of the freibergite series are compared in Table 8.…”

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Fig. 3.Reflectance curves for argentotetrahedrite-(Cd) compared with data for argentotetrahedrite-(Zn) from Kremnica, Slovak Republic (Sejkora et al ., 2022) and argentotetrahedrite-(Fe) from Keno Hill, Yukon, Canada (Welch et al ., 2018).

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“…Indeed, ‘freibergite’ was first described from the Hab Acht Mine near Freiberg, Saxony, Germany by Weissenbach (1831) and named by Kenngott (1853). The Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA–CNMNC) currently lists the freibergite series as argentotetrahedrite-(Fe) (Welch et al ., 2018), argentotetrahedrite-(Hg) (Wu et al ., 2021), argentotetrahedrite-(Zn) (Sejkora et al ., 2022), kenoargentotetrahedrite-(Fe) (the former freibergite – Welch et al ., 2018; Biagioni et al ., 2020a) and kenoargentotetrahedrite-(Zn) (Qu et al ., 2021). The arsenofreibergite series comprises fewer species, being currently populated only by argentotennantite-(Zn) (Spiridonov et al ., 1986; Biagioni et al ., 2020a) and kenoargentotennantite-(Fe) (Biagioni et al ., 2020b).…”

Tetrahedrite-(Ni), Cu6(Cu4Ni2)Sb4S13, the first nickel member of tetrahedrite group mineral from Luobusa chromite deposits, Tibet, China

“…Because the ionic radius of which seems like a common phenomenon in the tetrahedrite group minerals (Biagioni et al 2020bMauro et al 2021;Sejkora et al 2021Sejkora et al , 2022. As Biagioni et al…”