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

Crystal structure of Arcanite

Formula:

K2SO4

Crystal Data:

Crystal System: Orthorhombic - Dipyramidal

Point Group: 2/m 2/m 2/m

Cell Data:

Space Group: Pmcn, a = 5.76, b = 10.05, c = 7.46, Z = 4

Using the mouse (click here for more information)

Density (calc.) = 2.68 and V = 431.84 Å3
Element color: K, S, O
Arcanite sample
Arcanite

Synthetic sample




Click image to enlarge
Raman spectrum and vibrations of Arcanite
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 arcanite (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:
Reset view Front view Back view Left view Right view Top view Bottom view 		Background color:
Reset White(1) Black

Spin on Spin off
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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


Vectors on Vectors off
Measure distances Delete measure
Axes on Axes off
Interpretation of Raman spectrum of Arcanite

The Raman spectrum of the arcanite has the strongest intensity band at 985 cm-1, which was assigned to the symmetric stretching mode ν1 of SO4 tetrahedra. The ν2 mode (symmetric bending) appears at 457 cm-1, the ν3 mode (triply degenerate asymmetric stretching) at 1097 cm-1, 1108 cm-1 and 1146 cm-1. The ν4 mode (asymmetric bending) was found at 622 cm-1.


Arcanite Assignments
Buzgar et al., 20091 Montero et al., 1974
453 ν2 SO4
457 457
617 ν4 SO4
622 622
985 983 ν1 SO4
1094 1093 ν3 SO4
1108 1109
1110
1146 1145
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]

• MONTERO S., SCHMOLZ R. (1974) - Raman spectra of orthorhombic sulfate single crystals I: K2SO4, Rb2SO4, Cs2SO4 and Tl2SO4. Journal of Raman Spectroscopy, 2, p. 101-113 [link]