Mineralogy and origin of supergene mineralization at the Farbište ore occurrence near Poniky, central Slovakia

Števko, Martin; Sejkora, Jiří; Bačík, Peter

doi:10.3190/jgeosci.098

Cited by 8 publications

(3 citation statements)

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“…Chalcostibite sample was found in the abandoned gallery Ludovít at the hydrothermal antimony deposit Dúbrava, which is situated on the northern slopes of the Low Tatra Mountains, Slovakia . Chalcostibite forms irregular crystals and grains up to 5 cm in length in baryte gangue, in polished sections with one perfect and one indistinct cleavage planes (Figure a).…”

Section: Methodsmentioning

confidence: 99%

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Sejkora

Buixaderas

Škácha

et al. 2018

J Raman Spectroscopy

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Micro‐Raman spectroscopy was used to investigate the natural orthorhombic members (space group Pnma) along the CuSbS2–CuSbSe2 join: chalcostibite Cu1.01Sb1.00S1.99 from Dúbrava (Slovak Republic); Se‐rich chalcostibite Cu1.00(Sb0.99As0.02)Σ1.01(S1.29Se0.70)Σ1.99 and the new mineral příbramite Cu0.99(Sb1.03As0.01)Σ1.04(Se1.82S0.15)Σ1.97 both from the Příbram uranium and base‐metal district (Czech Republic). Stretching and bending vibrations of the pyramidal SbS3 groups occur between 350 and 200 cm−1; vibrations of SbSe3 groups are shifted to the range 240–80 cm−1 due to the almost twice heavier mass of Se compared with S. The shift of the ν1 symmetric Sb‐(S,Se) vibration was observed, yielding 113 cm−1, and for the ν3 antisymmetric stretching Sb‐(S,Se), vibration was about 127 cm−1. The wavenumber of the ν1 symmetric Sb–S stretching vibrations decreases with increasing Se content—from 336 (in chalcostibite) over 330 (in Se‐rich chalcostibite) to 326 cm−1 (in příbramite), and a similar situation was observed for the case of ν1 symmetric Sb–Se stretching vibrations from 220 in Se‐rich chalcostibite to 215 cm−1 in příbramite. The trend for the ν3 antisymmetric Sb‐(S,Se) stretching vibrations is the opposite, from 306 cm−1 in chalcostibite to 314 cm−1 in Se‐rich chalcostibite (Sb–S bonds) and from 180 cm−1 in Se‐rich chalcostibite to 185 cm−1 in příbramite (Sb–Se bonds). These small shifts are probably connected with the influencing of the bonding environment of SbS3 and SbSe3 pyramids. The vibrations of Cu‐S(Se) bonds are represented only by less intense bands, and the observed intense bands below 80 cm−1 should correspond to external modes.

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Section: Methodsmentioning

confidence: 99%

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Sejkora

Buixaderas

Škácha

et al. 2018

J Raman Spectroscopy

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“…Among others, copper arsenates are also common and widely distributed minerals in such oxidation zones (e.g. Števko et al, 2017;Southwood et al, 2020) where they form through weathering of sulfidic minerals.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties, crystal structure and phase relations of pushcharovskite [Cu(AsO3OH)(H2O) ⋅ 0.5H2O], geminite [Cu(AsO3OH)(H2O)] and liroconite [Cu2Al(AsO4)(OH)4 ⋅ 4H2&

et al. 2020

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Abstract. The phases pushcharovskite, geminite and liroconite were synthesized or acquired and characterized by powder X-ray diffraction, infrared spectroscopy, electron microprobe analysis, thermogravimetric analysis and optical emission spectrometry, as needed. Their thermodynamic properties were determined by a combination of acid-solution calorimetry and relaxation calorimetry, resulting in Gibbs free energies of formation (ΔfGo, all values in kilojoules per mole) of -1036.4±3.8 (pushcharovskite, Cu(AsO3OH)(H2O)⋅0.5H2O) and -926.7±3.2 (geminite, Cu(AsO3OH)(H2O)). For the natural liroconite (Cu2Al[(AsO4)0.83(PO4)0.17](OH)4⋅4H2O), ΔfGo=-2996.3±9.2 kJ mol−1. The estimated ΔfGo for the endmember Cu2Al(AsO4)(OH)4⋅4H2O is −2931.6 kJ mol−1. The crystal structure of liroconite was refined (R1=1.96 % for 962 reflections with I>3σ(I)) by single-crystal X-ray diffraction and the positions of H atoms, not known previously, were determined. Liroconite is a rare mineral, except for several localities, notably Wheal Gorland in England. Thermodynamic modelling showed that liroconite will be preferred over olivenite if the Al(III) concentration in the fluid reaches levels needed for saturation with X-ray amorphous Al(OH)3. We assume that such fluids are responsible for the liroconite formation during contemporaneous oxidation of primary Cu–As ores and pervasive kaolinization of the host peraluminous granites. pH had to be kept in mildly acidic (5–6), and the activities of dissolved silica were too low to form dioptase. The main stage with abundant liroconite formation was preceded by an acidic episode with scorodite and pharmacosiderite and followed by a late neutral to mildly basic episode with copper carbonates. Geminite and pushcharovskite, on the other hand, are minerals typical for very acidic solutions. At the studied site in Jáchymov (Czech Republic), extremely acidic water precipitates arsenolite; sulfate is removed by formation of gypsum. Geminite associates with other acidic minerals, such as slavkovite, yvonite and minerals of the lindackerite group. Pushcharovskite is metastable with respect to geminite and probably converts quickly to geminite under field conditions.

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“…By such con di tions, rock-form ing alu mi no sili cate min er als un dergo trans for ma tion rap idly. Mi gra tion of so lu tions out side the zones in di rect con tact with ore min er als un der go ing ox i dation and in flow of me te oric wa ters leads to an in crease in pH of these so lu tions and bind ing of sil ica and Cu 2+ ions in the form of chrysocolla (Schlomovitch et al, 1999;Crane et al, 2001;Števko et al, 2011). Pre cip i ta tion of goethite is sta bi lized by an el e vated pH.…”

Section: Ta Blementioning

confidence: 99%

Recently forming secondary copper minerals as indicators of geochemical conditions in an abandoned mine in Radzimowice (SW Poland)

Siuda

Kruszewski

2013

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1 In sti tute of Geo chem is try, Min er al ogy and Pe trol ogy, Uni ver sity of War saw, ¯wirki i Wigury 93, 02-089 Warszawa, Po land 2 In sti tute of Geo log i cal Sci ences, Pol ish Acad emy of Sci ences, Twarda 51/55, 00-818 Warszawa, Po land Siuda R. and Kruszewski £. (2013) Re cently formed sec ond ary cop per min er als as in di ca tors of geo chem i cal con di tions in an aban doned mine in Radzimowice (SW Po land). Geo log i cal Quar terly, 57 (4): 583-600, doi: 10.7306/gq.1114An oc cur rence of twelve re cently formed sec ond ary cop per min er als (SCM) was ob served in un der ground work ings of an aban doned Cu-As-Au mine in Radzimowice. The min er als, mainly sul phate spe cies, were iden ti fied us ing Pow der X-Ray Diffrac tion (PXRD), scan ning elec tron mi cro scope with en ergy dispersive spec tros copy sys tem (SEM-EDS) and elec tron microprobe anal y sis with wave length-dispersive spec trom e try sys tem (EPMA-WDS) meth ods. The SCM of Radzimowice form the fol low ing as sem blages: paragenesis I is char ac ter ized by langite, posnjakite, brochantite and devilline. These miner als crys tal lise di rectly from pH 6.0-7.0 mine wa ters. Paragenesis II also com prises hy drous cop per sulphates (HCS), and in ad di tion con tains na tive cop per, cu prite, ferrihydrite and gyp sum. Sec ond ary HCS mainly crys tal lise as prod ucts of re actions of sul phate-rich mine wa ters with na tive cop per and cu prite. The pH of these wa ters var ies from ~5.0 to 6.0. The III paragenesis is dom i nated by woodwardite, as so ci ated with vari able amounts of chalcoalumite and amor phous Cu-Al sulphates. Ac cu mu la tions of woodwardite oc cur in the zones where Al-and sul phate-rich acid mine wa ters (pH ~2.5-3.0) mix with neu tral wa ters (pH 6.5-7.0). Paragenesis IV is rare, dom i nated by chrysocolla, co ex ist ing with small amounts of mottramite and goethite. This as sem blage formed as a re sult of mo bi li za tion of sil ica re leased dur ing de com po si tion of rock-form ing aluminosilicates at tacked by acid mine wa ters.

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Mineralogy and origin of supergene mineralization at the Farbište ore occurrence near Poniky, central Slovakia

Cited by 8 publications

References 10 publications

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Thermodynamic properties, crystal structure and phase relations of pushcharovskite [Cu(AsO<sub>3</sub>OH)(H<sub>2</sub>O) ⋅ 0.5H<sub>2</sub>O], geminite [Cu(AsO<sub>3</sub>OH)(H<sub>2</sub>O)] and liroconite [Cu<sub>2</sub>Al(AsO<sub>4</sub>)(OH)<sub>4</sub> ⋅ 4H<sub>2&

Recently forming secondary copper minerals as indicators of geochemical conditions in an abandoned mine in Radzimowice (SW Poland)

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Mineralogy and origin of supergene mineralization at the Farbište ore occurrence near Poniky, central Slovakia

Cited by 8 publications

References 10 publications

Micro‐Raman spectroscopy of natural members along CuSbS2–CuSbSe2 join

Micro‐Raman spectroscopy of natural members along CuSbS2–CuSbSe2 join

Recently forming secondary copper minerals as indicators of geochemical conditions in an abandoned mine in Radzimowice (SW Poland)

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Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join