Das Kristallgitter des Kieserits MgSO4�H2O

Leonhardt, Jürgen; Weiss, R. J.

doi:10.1007/bf00630961

Cited by 27 publications

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“…Solutions of manganese(II), iron(II), cobalt(II), and nickel(I1) sulfates all yielded the monohydrates, MSO,.H,O, which are isomorphous with kieserite, MgSO,.H,O, which has a known structure (19). The insolubility of these and certain other basic sulfates (2,20) under hydrothermal conditions may reflect the fact that sulfate ion exists almost exclusively as HSO,-in water between 300 and 400 "C (21), so that aqueous MSO, at 300 "C exists as MOH+ and HS0,-.…”

Section: M(ii) Sulfatesmentioning

confidence: 99%

The Hydrothermal Chemistry of some Common Transition Metal Compounds

Kong¹,

Swaddle²,

Bayliss³

1971

Can. J. Chem.

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The stabilities of aqueous solutions of typical salts of manganese(II), iron(II), cobalt(II), cobalt(III), nickel(II), and copper(II) at temperatures up to 300 °C have been investigated. At 200 to 300 °C, hydrolysis of the metal ions can lead to the partial precipitation of metal oxides, or silicates in the cases of nickel(II) and cobalt(II) when a silica vessel is used; except for the M(II) sulfates, which precipitate as MSO4•H2O (M = Mn, Fe, Co, and Ni) and Cu3SO4(OH)4. Manganese(II), iron(II), and cobalt(II) tend to be oxidized at 250 to 300 °C in neutral or acidic solutions, while cobalt(III) in aqueous ammonia is reduced. Aqueous CuCl2 is in equilibrium with CuCl and Cl2 at 300 °C. Hydrolytic precipitation is suppressed by the addition of small concentrations of hydrogen ion or larger concentrations of chloride ion, if oxidation–reduction processes do not interfere.

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Section: M(ii) Sulfatesmentioning

confidence: 99%

The Hydrothermal Chemistry of some Common Transition Metal Compounds

Kong¹,

Swaddle²,

Bayliss³

1971

Can. J. Chem.

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“…The crystal structure of kieserite was ®rst solved by Leonardt & Weiss (1957) and has been re®ned several times since (Bre Â geault et al, 1970;Coing-Boyat, 1971;Bre Â geault et al, 1972;Hawthorne et al, 1987). The compound crystallizes in the C2/c space group with Z = 4.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Structural Parameters in Isostructural Series: the Kieserite Group

Aleksovska¹,

Petruševski²,

Šoptrajanov³

1998

Acta Crystallogr Sect B

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In order to demonstrate the possibility of predicting the structural parameters of members in a sequence of isostructural compounds, the kieserite group isotypes (with the general formula M II XO 4 .H 2 O) were chosen since a number of them have accurately re®ned crystal structures. The unit-cell parameters and the fractional atomic coordinates were shown to vary linearly with both cation and anion size. This makes it possible to calculate the structural parameters of a particular member, taking into account only the effective ionic radii of the constituent atoms. Agreement between the calculated and experimentally re®ned (by X-ray diffraction) structural parameters is good. The cell constants and atomic coordinates of FeSeO 4 .H 2 O, iron selenate monohydrate, are predicted in this way.

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“…Voudourisite, Cd(SO 4 )·H 2 O, belongs to the kieserite group M (SO 4 )·H 2 O, with M = Mg (kieserite), Mn (szmikite), Fe (szomolnokite), Co (cobaltkieserite), Ni (dwornikite), Zn (gunningite) and Cu/Fe (poitevinite), listed as subdivision 7.CB of the Strunz Mineralogical Tables (Strunz and Nickel, 2001). Except for poitevinite and voudourisite, these minerals crystallise in the monoclinic space group C 2/ c (Leonhardt and Weiss, 1957; Brégeault and Herpin, 1970; Hawthorne et al , 1987; Wildner and Giester, 1991; Holtstam, 2002), as do the synthetic compounds M (SeO 4 )·H 2 O where M = Mg, Mn, Co, Ni or Zn (Giester and Wildner, 1992). Poitevinite (Giester et al , 1994) is triclinic P , as observed for Cu( X O 4 )·H 2 O with X = S or Se (Giester, 1988).…”

Section: Structure Descriptionsmentioning

confidence: 99%

Voudourisite, Cd(SO₄)·H₂O, and lazaridisite, Cd₃(SO₄)₃·8H₂O, two new minerals from the Lavrion Mining District, Greece

Rieck

Lengauer

Giester

2018

MinMag

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Voudourisite, Cd(SO4)·H2O, and lazaridisite, Cd3(SO4)3·8H2O, are two new minerals from the Esperanza Mine, Kaminiza Area, Lavrion Mining District, Greece. This small ancient mine is also the type locality of niedermayrite and katerinopoulosite. Further associated minerals are sphalerite, galena, edwardsite, chalcanthite, gypsum and greenockite. Both secondary minerals form tiny clusters or crusts and are among the latest to form in this paragenetic sequence. They are colourless or white, transparent to translucent, with a white streak and vitreous lustre. No fluorescence is observed. The minerals exhibit conchoidal fracture, no cleavage or preferred parting. The Mohs hardness is ~3 and both have brittle tenacity. Voudourisite is biaxial (–) with refractive indices at 589(1) nm of α = 1.580(2), β = 1.624(2), γ = 1.640(2), 2Vmeas. = 70(5)°, 2Vcalc. = 61° and β ~ || [010]. Lazaridisite is biaxial neutral with refractive indices at 589(1) nm of α = 1.552(2), β = 1.561(2), γ = 1.570(2), 2Vmeas. = 90(5)° and 2Vcalc. = 90°. The chemical compositions of voudourisite and lazaridisite are close to ideal with only minor amounts of copper detectable. The atomic arrangement in voudourisite (space group P21/c with a = 7.633(2), b = 7.458(2), c = 8.151(2) Å, β = 122.35(1)° and V = 392.0(2) Å3) is related to that of kieserite while lazaridisite (space group C2/c with a = 14.813(3), b = 11.902(2), c = 9.466(2) Å, β = 97.38(1)° and V = 1655.2(6) Å3) is a distinct structure-type. Calculated densities are 3.838 and 3.088 g/cm3, respectively.The strongest lines in the powder X-ray pattern [d in Å (I) (hkl)] are: 4.890 (66) (110); 3.741 (25) (020); 3.578 (100) (11$\bar 2$); 3.230 (43) (200); 2.525 (33) (022); 2.395 (29) (112) for voudourisite and 6.860 (100) (200); 6.317 (72) (111); 5.965 (84) (020); 4.512 (58) (310); 3.727 (78) (202); 3.608(82)(13$\bar 1$); 3.109 (83) (40$\bar 2$); 3.020 (50) (33$\bar 1$) for lazaridisite, respectively.

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Das Kristallgitter des Kieserits MgSO4�H2O

Cited by 27 publications

References 0 publications

The Hydrothermal Chemistry of some Common Transition Metal Compounds

The Hydrothermal Chemistry of some Common Transition Metal Compounds

Calculation of Structural Parameters in Isostructural Series: the Kieserite Group

Voudourisite, Cd(SO₄)·H₂O, and lazaridisite, Cd₃(SO₄)₃·8H₂O, two new minerals from the Lavrion Mining District, Greece

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Das Kristallgitter des Kieserits MgSO4�H2O

Cited by 27 publications

References 0 publications

The Hydrothermal Chemistry of some Common Transition Metal Compounds

The Hydrothermal Chemistry of some Common Transition Metal Compounds

Calculation of Structural Parameters in Isostructural Series: the Kieserite Group

Voudourisite, Cd(SO4)·H2O, and lazaridisite, Cd3(SO4)3·8H2O, two new minerals from the Lavrion Mining District, Greece

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Product

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Voudourisite, Cd(SO₄)·H₂O, and lazaridisite, Cd₃(SO₄)₃·8H₂O, two new minerals from the Lavrion Mining District, Greece