Crystal structure of MgUO2(SO4)2�11H2O

Сережкин, В. Н.; Soldatkina, M; Ефремов, В. Н.

doi:10.1007/bf00747528

Cited by 4 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The synthetic equivalent of magnesioleydetite was reported by Serezhkin et al . (1981). The uranyl-sulfate sheets in the structures of magnesioleydetite and straβmannite are topologically identical, but are geometrical isomers.…”

Section: Description and Discussion Of The Structuresmentioning

confidence: 99%

Magnesioleydetite and straβmannite, two new uranyl sulfate minerals with sheet structures from Red Canyon, Utah

Kampf

Plášil

Kasatkin

et al. 2018

MinMag

View full text Add to dashboard Cite

Magnesioleydetite (IMA2017-063), Mg(UO2)(SO4)2·11H2O, and straβmannite (IMA2017-086), Al(UO2)(SO4)2F·16H2O, are two new minerals from mines in Red Canyon, San Juan County, Utah, USA. Magnesioleydetite occurs in the Markey mine and straβmannite occurs in both the Markey and Green Lizard mines. Both minerals are secondary phases found in efflorescent crusts on the surfaces of mine walls. Magnesioleydetite occurs in irregular aggregates (to ~0.5 mm) of blades (to ~0.2 mm) exhibiting the following properties: transparent to translucent; pale green–yellow colour; vitreous lustre; white streak; non-fluorescent; brittle; Mohs hardness ≈ 2; irregular fracture; one perfect cleavage on {001}; and calculated density = 2.463 g/cm3. Straβmannite occurs in irregular aggregates (to ~0.5 mm) of equant crystals (to ~0.2 mm) exhibiting the following properties: transparent; light yellow–green colour; vitreous to greasy lustre; nearly white streak; bright greenish-blue fluorescence; somewhat brittle, Mohs hardness ≈ 1½; irregular fracture; one good cleavage on {001}; measured and calculated densities of 2.20(2) and 2.173 g/cm3, respectively; optically biaxial (–); α = 1.477(2), β = 1.485(2) and γ = 1.489(2) (white light); 2Vmeas. = 72(2)°; dispersion r > v (slight); orientation Y = b, X ∧ c = 20° (in obtuse β); pleochroism with X = nearly colourless, Y = pale green–yellow and Z = light green–yellow (X < Y < Z). The empirical formulas for magnesioleydetite and straβmannite are (Mg0.56Fe0.26Zn0.11Mn0.01)Σ0.94(U0.99O2)(S1.015O4)2·11H2O and Al1.00Na0.16(U0.99O2)(S1.00O4)2[F0.58(OH)0.42]·16H2O, respectively. Magnesioleydetite is monoclinic, C2/c, a = 11.3513(3), b = 7.7310(2), c = 21.7957(15) Å, β = 102.387(7)°, V = 1868.19(16) Å3 and Z = 4. Straβmannite is monoclinic, C2/c, a = 11.0187(5), b = 8.3284(3), c = 26.6727(19) Å, β = 97.426(7)°, V = 2427.2(2) and Z = 4. The structures of magnesioleydetite (R1 = 0.016 for 2040 I > 2σI reflections) and straβmannite (R1 = 0.0343 for 2220 I > 2σI reflections) each contain uranyl-sulfate sheets based on the protasite-anion topology.

show abstract

Section: Description and Discussion Of The Structuresmentioning

confidence: 99%

Magnesioleydetite and straβmannite, two new uranyl sulfate minerals with sheet structures from Red Canyon, Utah

Kampf

Plášil

Kasatkin

et al. 2018

MinMag

View full text Add to dashboard Cite

show abstract

“…Refined unit-cell parameters for leydetite and for synthetic Mg(UO 2 )(SO 4 ) 2 (H 2 O) 11 . Leydetite, Mas d'Alary Leydetite, Mas d'Alary Mg(UO 2 )(SO 4 ) 2 (H 2 O) 11 Single-crystal; this studyPowder; this study Single-crystal;Serezhkin et al (1981) …”

mentioning

confidence: 87%

“…On the basis of the refined interatomic distances (Table 5), the bond-valence analysis (Table 6) was performed following the procedure of Brown (1981,2002). Serezhkin et al (1981). The current structure model for leydetite contains refined positions of hydrogen atoms, which were not determined in the earlier structure determination for the synthetic compound.…”

Section: Crystal Structure Of Leydetite Single-crystal X-ray Diffractionmentioning

confidence: 97%

“…Jean-Claude Leydet is especially known for his studies of uranium-bearing minerals (Boisson and Leydet, 1998a,b;Leydet, 2006) and, in particular, those of the Mas d'Alary deposit (Henriot and Leydet, 1998). In 1994 he discovered the new mineral deliensite (Vochten et al, 1997). In the same year he collected the new mineral described herein and named in his honour.…”

Section: Introductionmentioning

confidence: 98%

“…They are rare, but relatively widespread, due to the common association of sulfide minerals, such as pyrite and chalcopyrite with uraninite. Among the uranyl sulfate minerals only one, deliensite (Vochten et al, 1997;Plášil et al, 2012a), contains Fe 2+ as an essential constituent.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Leydetite, Fe(UO₂)(SO₄)₂(H₂O)₁₁, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France

et al. 2013

View full text Add to dashboard Cite

Leydetite, monoclinic Fe(UO2)(SO4)2(H2O)11(IMA 2012–065), is a new supergene uranyl sulfate from Mas d'Alary, Lodève, Hérault, France. It forms yellow to greenish, tabular, transparent to translucent crystals up to 2 mm in size. Crystals have a vitreous lustre. Leydetite has a perfect cleavage on (001). The streak is yellowish white. Mohs hardness is ∼2. The mineral does not fluoresce under long- or short-wavelength UV radiation. Leydetite is colourless in transmitted light, non-pleochroic, biaxial, with α = 1.513(2), γ = 1.522(2) (further optical properties could not be measured). The measured chemical composition of leydetite, FeO 9.28, MgO 0.37, Al2O30.26, CuO 0.14, UO340.19, SO321.91, SiO20.18, H2O 27.67, total 100 wt.%, leads to the empirical formula (based on 21 O a.p.f.u.), (Fe0.93Mg0.07Al0.04Cu0.01)Σ1.05(U1.01O2)(S1.96Si0.02)Σ1.98O8(H2O)11. Leydetite is monoclinic, space group C2/c, with a = 11.3203(3), b = 7.7293(2), c = 21.8145(8) Å, β = 102.402(3)°, V = 1864.18(10) Å3, Z = 4, and Dcalc = 2.55 g cm–3. The six strongest reflections in the X-ray powder diffraction pattern are [dobs in Å (I) (hkl)]: 10.625 (100) (002), 6.277 (1) (11), 5.321 (66) (004), 3.549 (5) (006), 2.663 (4) (008), 2.131 (2) (0 0 10). The crystal structure has been refined from single-crystal X-ray diffraction data to R1 = 0.0224 for 5211 observed reflections with [I > 3σ(I)]. Leydetite possesses a sheet structure based upon the protasite anion topology. The sheet consists of UO7 bipyramids, which share four of their equatorial vertices with SO4 tetrahedra. Each SO4 tetrahedron, in turn, shares two of its vertices with UO7 bipyramids. The remaining unshared equatorial vertex of the bipyramid is occupied by H2O, which extends hydrogen bonds within the sheet to one of a free vertex of the SO4 tetrahedron. Sheets are stacked perpendicular to the c direction. In the interlayer, Fe2+ ions and H2O groups link to the sheets on either side via a network of hydrogen bonds. Leydetite is isostructural with the synthetic compound Mg(UO2)(SO4)2(H2O)11. The name of the new mineral honours Jean Claude Leydet (born 1961), an amateur mineralogist from Brest (France), who discovered the new mineral.

show abstract

U6+ Minerals and Inorganic Compounds: Insights Into an Expanded Structural Hierarchy of Crystal Structures

Burns¹

2005

The Canadian Mineralogist

611

380

View full text Add to dashboard Cite

Crystal structure of MgUO2(SO4)2�11H2O

Cited by 4 publications

References 0 publications

Magnesioleydetite and straβmannite, two new uranyl sulfate minerals with sheet structures from Red Canyon, Utah

Magnesioleydetite and straβmannite, two new uranyl sulfate minerals with sheet structures from Red Canyon, Utah

Leydetite, Fe(UO₂)(SO₄)₂(H₂O)₁₁, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France

U6+ Minerals and Inorganic Compounds: Insights Into an Expanded Structural Hierarchy of Crystal Structures

Contact Info

Product

Resources

About

Crystal structure of MgUO2(SO4)2�11H2O

Cited by 4 publications

References 0 publications

Magnesioleydetite and straβmannite, two new uranyl sulfate minerals with sheet structures from Red Canyon, Utah

Magnesioleydetite and straβmannite, two new uranyl sulfate minerals with sheet structures from Red Canyon, Utah

Leydetite, Fe(UO2)(SO4)2(H2O)11, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France

U6+ Minerals and Inorganic Compounds: Insights Into an Expanded Structural Hierarchy of Crystal Structures

Contact Info

Product

Resources

About

Leydetite, Fe(UO₂)(SO₄)₂(H₂O)₁₁, a new uranyl sulfate mineral from Mas d’Alary, Lodève, France