The philipsbornite–segnitite solid-solution series from Rędziny, Eastern metamorphic cover of the Karkonosze granite (SW Poland)

Gołębiowska, Bożena; Włodek, Adam; Pieczka, Adam; Borkiewicz, Olaf J.; Polak, Marta

doi:10.14241/asgp.2015.036

Cited by 3 publications

(8 citation statements)

References 17 publications

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“…Karminit se často vyskytuje v asociaci s hojnějším beudantitem a segnititem (Kingsbury, Hartley 1960;Gołębiowska et al 2016). V České republice jde o poměrně vzácný minerál.…”

Section: Karminitunclassified

“…Na výrazně vylouženém až dutinovitém křemeni téměř bez sulfidů jsou hojné nápadně žluté a hnědožluté, jemně krystalické povlaky segnititu s beudantitem. V jejich okolí narůstá i ojedinělý červenohnědý jemnozrnný karminit, oproti těmto minerálům stabilnější ve fluidech s mírně vyšším pH (Gołębiowska et al 2016).…”

Section: Obr 15 Beudantit Obrůstaný Jehličkovitým Karminitem;unclassified

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Olovem bohatá oxidační zóna polymetalické mineralizace na lokalitě Kvasetice u Havlíčkova Brodu: distribuce minerálních asociací s pyromorfitem a arzenáty

Víšková¹,

Houzar²,

Škoda³

et al. 2022

Bull Mineral Petrolog

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Supergene mineral assemblages rich in Pb, As and P occur on the dumps after the historical mining of the base-metal deposit in Kvasetice (Havlíčkův Brod ore district, Bohemian-Moravian Highlands, Czech Republic). The primary hydrothermal assemblage of pyrite > sphalerite > arsenopyrite > galena >> boulangerite hosted in the quartz veins is partly different from other similar localities in this area, which belong to the typical k-pol ores with iron-rich sphalerite, pyrrhotite, pyrite, arsenopyrite and chalcopyrite. Kvasetice locality is characterized by a relatively higher stability of pyrite and sphalerite with a relatively low Fe content (< 0.12 apfu of Fe) compared to arsenopyrite and galena in supergene conditions, as well as a total deficit of Cu, Ca and partly S. In the supergene mineral association rich in Pb-P-Fe-As, two main assemblages can be distinguished. Supergene assemblage I contains common microscopic anglesite replacing galena and two sub-groups of arsenates with sulphide relics in small quartz veins: (a) in close association with the relic arsenopyrite are pharmacosiderite and hydroniumpharmacosiderite, both relatively Pb-rich (≤ 0.18 apfu of Pb), accompanied by a rare scorodite. (b) More abundant assemblage of segnitite >> beudantite > mimetite >> carminite and coronadite without a direct association with sulphides. Other phases with a non-stoichiometric Fe/As ratio (HFA) are only locally found. A sporadic greenockite is the only detected decomposition product of sphalerite. The Pb-Fe3+ sulfates (minerals of the jarosite subgroup), gypsum, and Ca-, Zn-, Sb- and Cu-supergene minerals are missing. Supergene assemblage II is mainly represented by pyromorphite (mostly with As below detection limit, but locally with ≤ 0.44 apfu), rarely by mimetite and only locally also by cerussite. They overgrow thin crusts of mainly Fe-oxyhydroxides covering the altered granite matrix or line thin druse quartz veinlets. The supergene mineral assemblages from Kvasetice differ not only from other localities in the ore district studied, but also from other localities of supergene mineralization in the Bohemian-Moravian Highlands. They are the product of weathering in the shallow supergene zone, however, they could also have been arised by subrecent weathering of materials deposited on the dumps during the 13-16th century.

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“…Karminit se často vyskytuje v asociaci s hojnějším beudantitem a segnititem (Kingsbury, Hartley 1960;Gołębiowska et al 2016). V České republice jde o poměrně vzácný minerál.…”

Section: Karminitunclassified

Section: Obr 15 Beudantit Obrůstaný Jehličkovitým Karminitem;unclassified

Olovem bohatá oxidační zóna polymetalické mineralizace na lokalitě Kvasetice u Havlíčkova Brodu: distribuce minerálních asociací s pyromorfitem a arzenáty

Víšková¹,

Houzar²,

Škoda³

et al. 2022

Bull Mineral Petrolog

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“…For example, carminite is an alteration product of arsenopyrite forms in the oxidized zone of lead-bearing deposits, and is commonly associated with beudantite and anglesite [37]. In addition, arsenolite, pitticite, schultenite and segnitite are reported as secondary products forming under oxidised conditions experienced in mine waste piles [38]. These mineral phases are not readily soluble in water, instead favouring strong alkaline or acid solutions [38].…”

Section: Heap Leach Pile Evolutionmentioning

confidence: 99%

“…In addition, arsenolite, pitticite, schultenite and segnitite are reported as secondary products forming under oxidised conditions experienced in mine waste piles [38]. These mineral phases are not readily soluble in water, instead favouring strong alkaline or acid solutions [38]. Therefore, during rainfall events, dissolved As in leachate is not significantly high at the base of the piles.…”

Section: Heap Leach Pile Evolutionmentioning

confidence: 99%

Geoenvironmental Characterisation of Heap Leach Materials at Abandoned Mines: Croydon Au-Mines, QLD, Australia

Parbhakar-Fox

2016

Minerals

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Abstract:Heap leaching is a well-established metallurgical technology which allows metal recovery (e.g., Au, Cu, U) from low-grade ores. However, spent heap leach materials remaining at abandoned or historic mine sites may represent a potential source of contamination. At the Croydon Au-mines, heap leaching operations (1984)(1985) were performed on mineralized rhyolites hosting sulphides including pyrite, galena, arsenopyrite and minor sphalerite. Characterization of spent heap leach materials (n = 14) was performed using established geochemical and mineralogical techniques, supplemented by automated mineralogical evaluations. Whilst these materials contained low sulphide-sulphur (0.08 to 0.41 wt %) and returned innocuous paste pH values (pH 5.1 to 8.6), they were classified uncertain by net acid producing potential/net acid generating criteria. This was likely due to the reaction of secondary mineral phases (i.e., beudantite, hidalgoite, kintoreite and Fe-As-Pb oxides) during these tests. It is hypothesised that during heap leaching, gangue sulphides have differentially reacted with the cyanide lixiviant, pre-conditioning the formation of these complex secondary phases during surficial oxidation, after heap leaching termination. These materials are considered to represent a moderate geoenvironmental risk as dissolved Pb in basal leachates is in excess of the World Health Organization (WHO 2006) guideline values. Considering this, these materials should be included in ongoing rehabilitation works at the site.

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“…Among alunitesupergroup minerals, the Pb-rich members of the dussertite group, segnitite, ideally PbFe 3 (AsO 3.5 (OH) 0.5 ) 2 (OH) 6 and philipsbornite, ideally PbAl 3 (AsO 3.5 (OH) 0.5 ) 2 (OH) 6 form typically under oxidising and acidic weathering conditions (e.g. Birch et al, 1992;Rattray et al, 1996;Moura et al, 2007;Sejkora et al, 2009Sejkora et al, , 2011Mills et al, 2014;Golebiowska et al, 2016;Pekov et al, 2016). The compositional variability of the philipsbornite-segnitite series and the coexistence of several solid solutions among arsenate, phosphate and sulfate alunite-supergroup end-members (notably plumbogummite, hidalgoite, kintoreite and beudantite) accompanied by minor Ba, Cu, Zn, Bi and Sb, has been described from different localities.…”

Section: Introductionmentioning

confidence: 99%

Secondary uranyl arsenates–phosphates and Sb–Bi-rich minerals of the segnitite–philipsbornite series in the oxidation zone at the Prakovce-Zimná Voda REE–U–Au quartz-vein mineralisation, Western Carpathians, Slovakia

Ondrejka,

Ferenc,

Majzlan

et al. 2023

MinMag

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This work is an investigation of the assemblages of supergene minerals occurring in hydrothermal REE–U–Au quartz-vein mineralisation at the Prakovce-Zimná Voda site, Slovakia. Heterogeneous uranyl arsenates and minor phosphates of the autunite group (nováčekite, kahlerite, threadgoldite, autunite, arsenuranospathite and chistyakovaite) together with scorodite and Sb–Bi-rich philipsbornite–segnitite-series minerals formed by oxidising fluids during decomposition and leaching of primary hypogene uraninite, brannerite and base-metal sulfides and sulfosalts. A progressive change of pH from acidic to near-neutral due to the gradual consumption of sulfides resulted in the formation of late phosphuranylite, pharmacosiderite and arseniosiderite. Goethite and other Fe oxides represent the latest hydrous ferric mineral phases and were formed after most of the As was already fixed in Fe arsenates. Antimony and Bi were taken up only into philipsbornite–segnitite and suggest unusual conditions during this process. X-ray absorption spectroscopy indicates that Sb in the philipsbornite–segnitite is fully oxidised (0.1–0.4 apfu Sb5+, octahedral coordination on the G site). Pentavalent Sb together with the presence of ferric oxides and arsenates and uranyl minerals suggest oxidative conditions during weathering. This study also indicates that hydrous ferric arsenates are dominant and stable secondary minerals in a supergene environment in a quartz vein rich in Fe and As accompanied by elevated concentrations of U, Pb, Sb, Bi, S, P, Ca and Ba under oxidising conditions.

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The philipsbornite–segnitite solid-solution series from Rędziny, Eastern metamorphic cover of the Karkonosze granite (SW Poland)

Cited by 3 publications

References 17 publications

Olovem bohatá oxidační zóna polymetalické mineralizace na lokalitě Kvasetice u Havlíčkova Brodu: distribuce minerálních asociací s pyromorfitem a arzenáty

Olovem bohatá oxidační zóna polymetalické mineralizace na lokalitě Kvasetice u Havlíčkova Brodu: distribuce minerálních asociací s pyromorfitem a arzenáty

Geoenvironmental Characterisation of Heap Leach Materials at Abandoned Mines: Croydon Au-Mines, QLD, Australia

Secondary uranyl arsenates–phosphates and Sb–Bi-rich minerals of the segnitite–philipsbornite series in the oxidation zone at the Prakovce-Zimná Voda REE–U–Au quartz-vein mineralisation, Western Carpathians, Slovakia

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