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Goslarite: Crystal structure | Sample photo | Raman spectrum | Interpretation | References

Crystal structure of Goslarite

Formula:

ZnSO4•7(H2O)

Crystal Data:

Crystal System: Orthorhombic - Disphenoidal

Point Group: 2 2 2

Cell Data:

Space Group: P 212121, a = 11.8176, b = 12.0755, c = 6.827, Z = 4

Density (calc.) = 1.96 and V = 974.24 Å3
Goslarite sample
Goslarite

Synthetic sample




Click image to enlarge
Raman spectrum and vibrations of Goslarite
Element color: S, O Toggle Grid Toggle Coordinates Reverse Spectrum

Click to in the Raman spectrum. To see the vibrations click on one of them (highlight region) and it (the selected vibration) will appear on the right side of the Raman spectrum.
Below spectra are various settings, and other vibrations of goslarite (which are not present in this spectrum).
You have the possibility to zoom in the spectrum by selecting a spectral region you need to be increased (along axis x); to zoom keep the left mouse-click continously pressed, drag (to left or to right) and release the left button. To return to the initial size spectrum, press the right click on the spectrum -> Zoom -> Reset View.
Model type:
Sticks Ball-and-Sticks (1) Ball-and-Sticks (2) CPK (Spacefill)

Orientation:
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SO4 polyhedra on SO4 polyhedra off 		Vibrations:
ν2 SO4 ν4 SO4 ν1 SO4 ν3 SO4

Vibration on Vibration off 		Download spectrum:
Raman spectrum .txt Raman spectrum .spc


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Interpretation of Raman spectrum of Goslarite

In the case of goslarite, the Raman spectrum is more complex. The characteristic bands for sulfate group vibrations were found at: 1024 cm-1 for the ν1 mode; at 423 cm-1 and 510 cm-1 for the ν2 mode; at 1084 cm-1 and 1191 cm-1 for the ν3 mode and at 626 cm-1 and 671 cm-1 for the ν4 mode. The peaks from the lower region of the spectrum, at the 223 cm-1 and 281 cm-1, were attributed to the translational modes of the cation with the oxygen from water. The band 1492 cm-1 was assigned to the ν2 bending mode of water molecule. Modes of O-H stretching were not observed in this study. The band at the wavenumber 913 cm-1 was attributed to vibrational modes of water molecules (Berger, 1976; Chio et al., 2007). The Raman spectra obtained in this study is very different from those mentioned in the literature (Shantakumari, 1953).


Goslarite Assignments
Buzgar et al., 20091 Shantakumari, 1953
223 252 T(M, H2O)
281 373
423 445 ν2 SO4
510 461
626 609 ν4 SO4
671 620
913 ν(H2O)
1024 990 ν1 SO4
1057 ν3 SO4
1084 1062
1094
1121
1141
1191
1492 ν(H2O)
3154
3342
3436
3512
References

• The Mineralogy Database [link]

• Crystal data (.cif file) from the American Mineralogist Crystal Structure Database [link]

• 1BUZGAR N., BUZATU A., SANISLAV I. V. (2009) - The Raman study on certain sulfates. Analele Stiintifice ale Universitatii “Al. I. Cuza” - Iasi, Tome 55, issue 1, 5-23 [link]

• Berger, J. (1976) - Infrared and Raman spectra of CuSO4•5H2O; CuSO4•5D2O; and CuSeO4•5H2O. Journal of Raman Spectroscopy, 5, 103-114. [link]

• Chio, C. H., Sharma, S. K., Muenow, D. W. (2007) - The hydrates and deuterates of ferrous sulfate (FeSO4): a Raman spectroscopic study. Journal of Raman Spectroscopy, 38, 87-99.[link]

• Shantakumari, C. (1953) - Raman spectra of crystalline sulphates of zinc, magnesium and sodium. Proceedings of the Indian Academy of Science A, 37, 393-399. [link]