Pseudojohannite from Jachymov, Musonoi, and La Creusaz: A new member of the zippeite-group

Brugger, Joël; Wallwork, Kia S.; Meisser, Nicolas; Pring, Allan; Ondruš, Petr; Čejka, Jiří

doi:10.2138/am.2006.1885

Cited by 27 publications

(21 citation statements)

References 12 publications

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“…Originally it was reported to be triclinic, Cu 5 (UO 2 ) 6 (SO 4 ) 3 (OH) 16 (H 2 O) 14 , with a = 13.754(2), b = 9.866(1), c = 8.595(2) Å, α = 103.84(2)°, β = 90.12(2)°, γ = 106.75(2)°, and V = 1081.3(4) Å 3 . Brugger et al (2006) concluded that pseudojohannite is a member of the zippeite group, based on the characteristic U:S ratio 2:1 (Burns 2005; Krivovichev and Plášil 2013), and they revised chemical formula of pseudojohannite accordingly to Cu 6.5 [(UO 2 ) 4 O 4 (SO 4 ) 2 ] 2 (OH) 5 (H 2 O) 25 . The final conclusion that pseudojohannite is a member of the zippeite-group of minerals was documented by the full crystal structure solution presented by Plášil et al (2012) on the material from Widowmaker mine, White Canyon, Utah, USA.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure refinement of pseudojohannite, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12, from the type locality - Jáchymov, Czech Republic

Plášil¹

2015

Jour. Geosci.

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The crystal structure of pseudojohannite from the type locality, Jáchymov (Western Bohemia, Czech Republic), was solved by charge-flipping method from single-crystal X-ray diffraction data and refined to an R = 0.0385 against 2072 unique observed reflections. Pseudojohannite from Jáchymov is triclinic, P1, with a = 8.6653(4), b = 8.8499(5) Å, c = 9.9908(6), α = 72.103(6), β = 70.512(5)°, γ = 76.070(5)°, V = 679.12(7) Å 3 and Z = 1. The structural formula derived from the refinement and bond-valence considerations is Cu 3 (OH) 2 [(UO 2 ) 4 O 4 (SO 4 ) 2 ](H 2 O) 12 , confirming previous structure determination on the material from Widowmaker mine, Utah, USA. Contrary to other members of the zippeite-group, the interstitial metal sites in pseudojohannite (populated by Cu 2+ ), are fully occupied and the structure tends to be fully ordered with no important departure from the ideal stoichiometry.

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Section: Introductionmentioning

confidence: 99%

Crystal structure refinement of pseudojohannite, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12, from the type locality - Jáchymov, Czech Republic

Plášil¹

2015

Jour. Geosci.

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“…Uranyl-sulfates are typical products of uraninite alteration in the acidic oxidizing environment (Ondruš et al 1997;Finch and Murakami 1999;Meisser et al 2002;Brugger et al 2003Brugger et al , 2006Plášil et al 2012a, b;Krivovichev and Plášil 2013;Plášil 2014). The sulfate-rich solutions, resulting from the decomposition of the primary sulfide minerals by descending oxidizing waters, are responsible for the migration of the uranyl ion (UO 2 ) 2+ under the low pH conditions (Fernandes et al 1995;Brugger et al 2003, and references therein).…”

Section: Introductionmentioning

confidence: 99%

The recent weathering of uraninite from the Červená vein, Jáchymov (Czech Republic): a fingerprint of the primary mineralization geochemistry onto the alteration association

Plášil¹,

Sejkora²,

Škoda³

et al. 2014

Jour. Geosci.

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Uraninite and the supergene minerals from the Červená hydrothermal uranium vein (Jáchymov ore district, Czech Republic) were studied. These supergene minerals represent alteration products of the joint weathering of uraninite and hypogene sulfide minerals, connected to the acid-mine drainage (AMD) systems. The complex geochemistry of the hypogene mineralization provided a unique environment for formation of chemically diverse supergene phases. Among other features, the weathering system is characterized by the high activity of Cu 2+ and REE, which control the composition of the resulting supergene minerals: commonly occurring are Cu-dominant uranyl sulfates of the zippeite group (pseudojohannite, Cu-rabejacite), Cu-dominant uranyl silicates (cuprosklodowksite) or Y-and REE-containing uranyl-sulfate mineral sejkoraite-(Y). The high activity of Cu 2+ and REE is also reflected by the fact that both elements enter minerals, which are nominally Cu-or REE-free (marécottite, rabejacite, tyuyamunite, and compreignacite). The alteration association was evaluated with regard to the crystal-chemical properties of each mineral using the bond-valence approach, documenting distinct evolutionary trends during weathering.

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“…The structures of the most abundant uranyl sulfates are based upon structural units consisting of uranyl pentagonal bipyramids (Urφ 5 ; Ur = UO 2 2+ , uranyl ion, φ = unspecified ligand) and SO 4 tetrahedra (Burns 2005). Urφ 5 bipyramids may polymerize by sharing equatorial edges as in the structures of zippeite-group minerals (Vochten et al 1995;Brugger et al 2003;Burns et al 2003;Brugger et al 2006;Peeters et al 2008;Plášil et al 2011aPlášil et al , b, 2012Plášil et al , 2013a, uranopilite (Burns 2001), johannite (Mereiter 1982) and deliensite (Plášil et al 2013b). The Urφ 5 bipyramids and SO 4 tetrahedra are usually linked by corner-sharing only, although several structures involving edge-sharing between uranyl and sulfate polyhedra have also been described (Mikhailov et al 1977;Hayden and Burns 2002a, b).…”

Section: Introductionmentioning

confidence: 99%

The modular structure of the novel uranyl sulfate sheet in [Co(H2O)6]3[(UO2)5(SO4)8(H2O)](H2O)5

Krivovichev¹,

Burns²

2014

J. Geosci.

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5 , has been synthesized using mild hydrothermal methods. The structure (monoclinic, P2 1 /c, a = 27.1597(14), b = 9.9858(5), c = 22.7803(12) Å, β = 106.520(1)°, V = 5923.2(5) Å 3 , Z = 4) has been solved by direct methods and refined on the basis of F 2 for all unique reflections to R 1 = 0.056, calculated for the 9124 unique observed reflections (|F o | ≥ 4σ F ). It contains five symmetrically distinct uranyl pentagonal bipyramids and eight sulfate tetrahedra that link via the sharing of vertices between uranyl polyhedra and sulfate tetrahedra, resulting in sheets parallel to (001). Adjacent sheets are linked by hydrogen bonds to Co 2+ (H 2 O) 6 octahedra and H 2 O groups located in the interlayer. The uranyl sulfate sheet contains four-and five-connected uranyl pentagonal bipyramids and three-and four-connected sulfate tetrahedra. The sheet may be constructed using modules from related structures involving pentagonal bipyramids and tetrahedra, and is readily described using a nodal representation. In general, the uranyl sulfate sheets in [Co(H 2 O) 6 ] 3 [(UO 2 ) 5 (SO 4 ) 8 (H 2 O)](H 2 O) 5 are more rigid than the structural units typically found in comparable uranyl molybdates, which involve the sharing of vertices between uranyl pentagonal bipyramids and molybdate tetrahedra.

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Pseudojohannite from Jachymov, Musonoi, and La Creusaz: A new member of the zippeite-group

Cited by 27 publications

References 12 publications

Crystal structure refinement of pseudojohannite, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12, from the type locality - Jáchymov, Czech Republic

Crystal structure refinement of pseudojohannite, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12, from the type locality - Jáchymov, Czech Republic

The recent weathering of uraninite from the Červená vein, Jáchymov (Czech Republic): a fingerprint of the primary mineralization geochemistry onto the alteration association

The modular structure of the novel uranyl sulfate sheet in [Co(H2O)6]3[(UO2)5(SO4)8(H2O)](H2O)5

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