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1-20 OF 54 RESULTS FOR
leonite
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Journal Article
Dehydration of blödite, Na 2 Mg(SO 4 ) 2 (H 2 O) 4 , and leonite, K 2 Mg(SO 4 ) 2 (H 2 O) 4 Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 March 2016
European Journal of Mineralogy (2016) 28 (1): 33–42.
...Tonči Balić-Žunić; Renie Birkedal; Anna Katerinopoulou; Paola Comodi Abstract The high-temperature behaviour of blödite (Na 2 Mg(SO 4 ) 2 (H 2 O) 4 ) and leonite (K 2 Mg(SO 4 ) 2 (H 2 O) 4 ) was studied by X-ray diffraction on powder samples in open capillaries and by thermo-gravimetry/calorimetry...
Journal Article
Vibrational spectroscopy of phase transitions in leonite-type minerals Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 November 2002
European Journal of Mineralogy (2002) 14 (6): 1009–1017.
...Birgit HERTWECK; Eugen LIBOWITZKY Abstract Infrared (IR) and Raman spectra of leonite-type minerals, K 2 Me(SO 4 ) 2 .4H 2 O (Me = Mg, Mn, Fe), confirm a succession of structural phase transitions between 277 and 120 K. Because the orientation and dynamic behaviour of the sulphate tetrahedra...
Journal Article
The crystal structures of the low-temperature phases of leonite-type compounds, K 2 Me(SO 4 ) 2 ·4H 2 O (Me 2+ = Mg, Mn, Fe) Available to Purchase
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 October 2001
American Mineralogist (2001) 86 (10): 1282–1292.
...Birgit Hertweck; Gerald Giester; Eugen Libowitzky Abstract Recent optical and differential scanning calorimetry measurements indicate phase transitions in leonite-type compounds at low temperatures. The crystal structures of these phases, i.e., leonite, K 2 Mg(SO 4 ) 2 ·4H 2 O, “Mn-leonite”, K 2 Mn...
Journal Article
Leonite [K 2 Mg(SO 4 ) 2 · 4 H 2 O], konyaite [Na 2 Mg(SO 4 ) 2 · 5 H 2 O] and syngenite [K 2 Ca(SO 4 ) 2 ·H 2 O] from Tausoare Cave, Rodnei Mts, Romania Available to Purchase
Journal: Mineralogical Magazine
Published: 01 February 2001
Mineralogical Magazine (2001) 65 (1): 103–109.
... analysis, scanning electron microscopy and electron microprobe. Beside thenardite (dehydration product of mirabilite) we also identified three sulphate minerals: leonite [K 2 Mg(SO 4 ) 2 ·4H 2 O], syngenite [K 2 Ca(SO 4 ) 2 ·H 2 O] and konyaite [Na 2 Mg(SO 4 ) 2 ·5H 2 O]. Of these, leonite and konyaite...
Journal Article
Mereiterite, K 2 Fe[SO 4 ] 2 .4H 2 O, a new leonite-type mineral from the Lavrion mining district, Greece Available to Purchase
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 June 1995
European Journal of Mineralogy (1995) 7 (3): 559–566.
Image
FTIR absorption spectra of the sulphate stretching modes in (a) leonite, (b... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 5. FTIR absorption spectra of the sulphate stretching modes in (a) leonite, (b) “Mn-leonite”, and (c) mereiterite. Dashed lines indicate the appearance and disappearance of vibrational modes at the I 2/ a ⟷ P 2 1 / a phase transitions in leonite and “Mn-leonite”. Temperature steps
Image
FTIR absorption spectra of the O-H stretching modes in (a) leonite, (b) “Mn... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 6. FTIR absorption spectra of the O-H stretching modes in (a) leonite, (b) “Mn-leonite”, and (c) mereiterite. Dashed lines indicate the appearance of additional vibrational modes at the I 2/ a ⟷ P 2 1 / a phase transitions in leonite and “Mn-leonite”. Temperature steps
Image
Full Width Half Maximum and peak centre of the ν −1 sulphate modes in Ra... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 3. Full Width Half Maximum and peak centre of the ν −1 sulphate modes in Raman spectra as a function of temperature in (a) leonite, (b) “Mn-leonite”, and (c) mereiterite. Vertical dashed lines indicate the transition temperatures of the C 2/ m ⟷ I 2/ a ⟷ P 2 1 / a phase transitions
Image
The crystal structures of the leonite-type compounds in a projection along ... Available to Purchase
in The crystal structures of the low-temperature phases of leonite-type compounds, K 2 Me(SO 4 ) 2 ·4H 2 O (Me 2+ = Mg, Mn, Fe)
> American Mineralogist
Published: 01 October 2001
F igure 1. The crystal structures of the leonite-type compounds in a projection along [001]. Approximately half of the unit cell is plotted along [100]. Groups of MeO 6 octahedra with two sulfate tetrahedra are oriented nearly parallel to [100]. They are interconnected by K atoms (large
Image
Examples of autocorrelation analyses of Raman and FTIR absorption spectra o... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 8. Examples of autocorrelation analyses of Raman and FTIR absorption spectra of leonite-type compounds. Vertical dashed lines indicate the transition temperatures of the C 2/ m ⟷ I 2/ a ⟷ P 2 1 / a phase transitions for leonite and “Mn-leonite”, and the transition temperature of the C
Image
Raman spectra of the sulphate ν 3 and ν 4 modes in leonite-type compo... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 2. Raman spectra of the sulphate ν 3 and ν 4 modes in leonite-type compounds. Vertical lines (as a guide for the eye) indicate the appearance or disappearance, respectively, of vibrational modes at the I 2/ a ⟷ P 2 1 / a phase transitions for leonite and “Mn-leonite”. (a) Raman
Image
Details of the hydrogen bonds surrounding the tetrahedra in the crystal str... Available to Purchase
in The crystal structures of the low-temperature phases of leonite-type compounds, K 2 Me(SO 4 ) 2 ·4H 2 O (Me 2+ = Mg, Mn, Fe)
> American Mineralogist
Published: 01 October 2001
F igure 2. Details of the hydrogen bonds surrounding the tetrahedra in the crystal structures of leonite and “Mn-leonite”. ( a ) S o tetrahedron of the I 2/ a crystal structure ( b ) S d tetrahedron of the I 2/ a (left) and C 2/ m (right) crystal structures.
Image
Crystal structures of (a) blödite and (b) leonite. Sulphate groups are colo... Available to Purchase
in Dehydration of blödite, Na 2 Mg(SO 4 ) 2 (H 2 O) 4 , and leonite, K 2 Mg(SO 4 ) 2 (H 2 O) 4
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 1 Crystal structures of (a) blödite and (b) leonite. Sulphate groups are coloured grey, MgO 6 octahedra orange. Hydrogen atoms are represented black, Na atoms yellow and K atoms red. For the sake of clarity, for leonite an ordered low-temperature polymorph ( Hertweck et al. , 2001
Image
TGA curve, the first derivative of the TGA curve, and the DSC curve for leo... Available to Purchase
in Dehydration of blödite, Na 2 Mg(SO 4 ) 2 (H 2 O) 4 , and leonite, K 2 Mg(SO 4 ) 2 (H 2 O) 4
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 5 TGA curve, the first derivative of the TGA curve, and the DSC curve for leonite, K 2 Mg(SO 4 ) 2 (H 2 O) 4 . At the bottom are indicated the results of the X-ray diffraction analysis. The red line marks the presence of leonite and kainite whereas the blue line marks the presence
Image
Schematic picture of the phase transitions of the leonite-type compounds. T... Available to Purchase
in The crystal structures of the low-temperature phases of leonite-type compounds, K 2 Me(SO 4 ) 2 ·4H 2 O (Me 2+ = Mg, Mn, Fe)
> American Mineralogist
Published: 01 October 2001
F igure 4. Schematic picture of the phase transitions of the leonite-type compounds. The room temperature phases have a crystal structure with space group C 2/ m , the intermediate phases have a crystal structure with space group I 2/ a and the low-temperature phases have a crystal structure
Image
The thermal evolution of (δ ΔCorr) 2 and (δFWHM) 2 for (a) autocorrelated... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 9. The thermal evolution of (δ ΔCorr) 2 and (δFWHM) 2 for (a) autocorrelated IR spectra of mereiterite in the range between 900 and 1300 cm −1 , (b) autocorrelated Raman spectra of mereiterite in the range between 1095.3 and 1159.8 cm −1 shift, (c) autocorrelated IR spectra of leonite
Image
FTIR absorption spectra of the sulphate bending modes of the leonite-type c... Available to Purchase
in Vibrational spectroscopy of phase transitions in leonite-type minerals
> European Journal of Mineralogy
Published: 01 November 2002
Fig. 4. FTIR absorption spectra of the sulphate bending modes of the leonite-type compounds in the indicated temperature ranges. Dashed lines (as a guide for the eye) indicate the appearance and disappearance of vibrational modes at the I 2/ a ⟷ P 2 1 / a phase transitions in leonite
Image
Platy crystal of konyaite on matrix of leonite and mirabilite. Available to Purchase
in Leonite [K 2 Mg(SO 4 ) 2 · 4 H 2 O], konyaite [Na 2 Mg(SO 4 ) 2 · 5 H 2 O] and syngenite [K 2 Ca(SO 4 ) 2 ·H 2 O] from Tausoare Cave, Rodnei Mts, Romania
> Mineralogical Magazine
Published: 01 February 2001
F ig . 3. Platy crystal of konyaite on matrix of leonite and mirabilite.
Image
Relative changes of the crystal lattice parameters of leonite (black) and k... Available to Purchase
in Dehydration of blödite, Na 2 Mg(SO 4 ) 2 (H 2 O) 4 , and leonite, K 2 Mg(SO 4 ) 2 (H 2 O) 4
> European Journal of Mineralogy
Published: 01 March 2016
Fig. 6 Relative changes of the crystal lattice parameters of leonite (black) and kainite (red) with temperature. The monoclinic angles show a negligible change and are omitted.
Journal Article
Cationic Exchange between Montmorillonite and Pore Solution Salts in Hydrothermal Clays from Steam Hydrotherms of the Mutnovsky Geothermal Field Available to Purchase
A.V. Sergeeva, T.P. Tikhonov, A.A. Avilova, M.A. Nazarova, O.A. Zoben’ko, E.V. Kartasheva, A.A. Kuzmina, A.V. Gladyshkina
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 December 2024
Russ. Geol. Geophys. (2024) 65 (12): 1468–1484.
... is subjected to degradation when they dry out. Crystallization of salts from pore solutions in the near-surface horizons of the studied thermal fields can be exemplified by szomolnokite FeSO 4 ‧H 2 O, metavoltine K 2 Na 6 Fe 2+ Fe 3+ 6 O 2 (SO 4 ) 12 ·18H 2 O, leonite K 2 Mg(SO 4 ) 2 ‧2H 2 O, polyhalite K 2 Ca...
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