Lillianite homologues from Kutná Hora ore district, Czech Republic: a case of large-scale Sb for Bi substitution

Pažout, Richard

doi:10.3190/jgeosci.235

Cited by 12 publications

(29 citation statements)

References 11 publications

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“…The presence of Bi and Sn (each from a different mineralization sequence) is typical, while it is completely absent in the former, silver-rich assemblage. The pyrite-rich assemblage yields a rich suite of Ag-Pb-Bi-Sb sulfosalts, recently studied by Pažout [22,23].…”

Section: Kutná Hora Ore Districtmentioning

confidence: 99%

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Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

2019

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Significant selenium enrichment associated with selenides and previously unknown Ag-Pb-Sb, Ag-Sb and Pb-Sb sulfosalts has been discovered in hydrothermal ore veins in the Anthony of Padua mine near Poličany, Kutná Hora ore district, central Bohemia, Czech Republic. The ore mineralogy and crystal chemistry of more than twenty silver minerals are studied here. Selenium mineralization is evidenced by a) the occurrence of selenium minerals, and b) significantly increased selenium contents in sulfosalts. Identified selenium minerals include aguilarite and selenides naumannite and clausthalite. The previously unknown sulfosalts from Kutná Hora are identified: Ag-excess fizélyite, fizélyite, andorite IV, andorite VI, unnamed Ag-poor Ag-Pb-Sb sulfosalts, semseyite, stephanite, polybasite, unnamed Ag-Cu-S mineral phases and uytenbogaardtite. Among the newly identified sulfides is argyrodite; germanium is a new chemical element in geochemistry of Kutná Hora. Three types of ore were recognized in the vein assemblage: the Pb-rich black ore (i) in quartz; the Ag-rich red ore (ii) in kutnohorite-quartz gangue; and the Ag-rich ore (iii) in milky quartz without sulfides. The general succession scheme runs for the Pb-rich black ore (i) as follows: galena – boulangerite (– jamesonite) – owyheeite – fizélyite – Ag-exces fizélyite – andorite IV – andorite VI – freieslebenite – diaphorite – miargyrite – freibergite. For the Ag-rich red ore (ii) and ore (iii) the most prominent pattern is: galena – diaphorite – freibergite – miargyrite – pyragyrite – stephanite – polybasite – acanthite. The parallel succession scheme progresses from Se-poor to Se-rich phases, i.e., galena – members of galena – clausthalite solid solution – clausthalite; miargyrite – Se-rich miargyrite; acanthite – aguilarite – naumannite. A likely source of selenium is in the serpentinized ultrabasic bodies, known in the area of “silver” lodes in the South of the ore district, which may enable to pre-concentrate selenium, released into hydrothermal fluids during tectonic events. The origin of the studied ore mineralization is primarily bound to the youngest stage of mineralization of the whole ore district, corresponding to the Ag-Sb sequence of the ´eb´ ore type of the Freiberg ore district in Saxony (Germany) and shows mineralogical and geochemical similarities to low-sulfidation epithermal-style Ag-Au mineralization.

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Section: Kutná Hora Ore Districtmentioning

confidence: 99%

“…The pyrite-rich assemblage has recently yielded a rich suite of Ag-Pb-Bi-Sb sulfosalts. Recently identified minerals from northern lodes include terrywallaceite, vikingite, treasurite, eskimoite, erzwiesite, izoklakeite, aramayoite [22,23] and new mineral staročeskéite [24]. [26].…”

Section: Introductionmentioning

confidence: 99%

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

2019

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“…до присвоения терриуолласеиту статуса минерального вида комиссией по новым минералам, номенклатуре и классификации минералов мма р. пажоут и м. душек расшифровали кристаллическую структуру сульфосоли AgPb(Bi 2 Sb) Σ3 S 6 из рудного района кутна гора, в 60 км восточнее праги (чехия), которую они трактовали как «Sbобогащенный густавит» . впоследствии данный образец также был отнесен к терриуолласеиту (Yang et al, 2013;Pažout, 2017). изучив с помощью электронно-зондового и рентгенодифракционного методов дополнительные образцы из жилы староческе пасмо рудного района кутна гора, р. пажоут обнаружил в них целый ряд сульфосолей лиллианитовой гомологической серии, включая минералы ряда густавит-терриуолласеит-староческеит-андорит, демонстрирующие даже в рамках одного зерна взаимные переходы друг в друга (Pažout, 2017).…”

Section: Introductionunclassified

“…впоследствии данный образец также был отнесен к терриуолласеиту (Yang et al, 2013;Pažout, 2017). изучив с помощью электронно-зондового и рентгенодифракционного методов дополнительные образцы из жилы староческе пасмо рудного района кутна гора, р. пажоут обнаружил в них целый ряд сульфосолей лиллианитовой гомологической серии, включая минералы ряда густавит-терриуолласеит-староческеит-андорит, демонстрирующие даже в рамках одного зерна взаимные переходы друг в друга (Pažout, 2017).…”

Section: Introductionunclassified

Terrywallaceite from the Kochkar Au Deposit, South Urals: First Find in Russia

Kasatkin¹,

Škoda²

2020

Минералогия (Mineralogy)

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Terrywallaceite, AgPb(Sb,Bi)3S6, a rare sulfosalt of the lillianite homologous series, was found in a sample from the Kochkar Au deposit (Chelyabinsk oblast). It occurs as anhedral grains up to 0.4 × 0.3 mm and is associated with Sb-bearing bismuthinite, tetrahedrite-(Fe), arsenopyrite and minerals of the tintinaite–kobellite series. Its average empirical formula based on eight analyses is as follows: (Ag0.97Cu0.07)Σ1.04(Pb0.94Cd0.02)Σ0.96(Bi1.84Sb1.17)Σ3.01(S5.99Se0.01)Σ6.00.The monoclinic unit cell dimensions are a = 6.992(2), b = 19.328(4), c = 8.381(10) Å, β = 107.68(7)°, V = 1079(1)Å³. This is the first reliable find of the mineral in Russia. Figures 3. Tables 3. References 24. Key words: terrywallaceite, Kochkar Au deposit, South Urals, first find of mineral in Russia, lillianite homologous series.

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“…The pyrite-rich assemblage comprises pyrite, arsenopyrite, sphalerite, Ag-bearing galena, pyrrhotite, marcasite, chalcopyrite, stannite, freibergite-tetrahedrite and Pb-Sb(-Ag) and Ag-Bi-Pb sulphosalts (Pažout 2017) in quartz gangue without kutnahorite.…”

Section: Geological Settingmentioning

confidence: 99%

An unusual Ni-Sb-Ag-Au association of ullmannite, allargentum, Au-rich silver and Au-bearing dyscrasite from Oselské pásmo “silver” Lode of Kutná Hora Pb-Zn-Ag ore district (Czech Republic)

Pažout¹,

Šrein²,

Korbelová³

2018

Jour. Geosci.

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A rare and unusual Ni-Sb-Ag-Au association of ullmannite, NiSbS, associated with allargentum, Ag 6 Sb, Au-rich silver, Au 9.7 Ag 85.0 Sb 2.9 , and Au-bearing dyscrasite was found in medieval mine dump material of the Oselské pásmo "silver" lode of the historic Kutná Hora Pb-Zn-Ag ore district. Ullmannite is the first and only Ni sulphide found in the base--metal paragenesis of otherwise exclusively Ag-(Cu)-(Pb)-Sb sulphosalts. No other nickel mineral is known from this base-metal ore district. The mineral was identified in two polished sections of one sample as anhedral grains up to 50 µm across enclosed in allargentum. The average chemical composition of ullmannite Ni 26.76-27.17, Sb 57.80-59.17, S 15.14-15.28 wt. % corresponds to the empirical formula Ni 0.98 Sb 1.01 As 0.01 S 1.00 on the basis of Ni + Sb + S = 3 apfu, i.e. it is close to the ideal formula with only trace contents of As. Au-rich silver with 15.52-16.34 wt. % of gold was found in association with freibergite and pyrargyrite as anhedral inclusions up to c. 5 µm across. The chemical composition corresponds to Au 9.7 Ag 85.0 Sb 2.9 on the basis of 100 apfu. One more gold-containing phase was determined: Au-bearing dyscrasite with ~0.7 wt. % of Au. The sample also produced an example of Ag-rich "bonanza" with stephanite, acanthite, pyrargyrite and miargyrite. The likely source of nickel and gold were the serpentinized ultrabasic bodies, cut by the "silver" lodes in the South of the ore district. The serpentinites contain 2000 ppm of Ni and low but stable contents of Au. Penetration of hydrothermal fluids could have caused the mobilization of nickel and gold in serpentinites and in earlier ore mineralization (arsenopyrite). This process resulted in the breakdown of earlier silver minerals while allargentum, dyscrasite and stephanite crystallized. The discovery of Ni-Sb-Ag-Au association in Kutná Hora ore district sheds new light on the elemental variability of this hydrothermal vein-type deposit of Variscan age.

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Lillianite homologues from Kutná Hora ore district, Czech Republic: a case of large-scale Sb for Bi substitution

Cited by 12 publications

References 11 publications

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

Ag-Pb-Sb Sulfosalts and Se-rich Mineralization of Anthony of Padua Mine near Poličany—Model Example of the Mineralization of Silver Lodes in the Historic Kutná Hora Ag-Pb Ore District, Czech Republic

Terrywallaceite from the Kochkar Au Deposit, South Urals: First Find in Russia

An unusual Ni-Sb-Ag-Au association of ullmannite, allargentum, Au-rich silver and Au-bearing dyscrasite from Oselské pásmo “silver” Lode of Kutná Hora Pb-Zn-Ag ore district (Czech Republic)

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