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

Crystal structure of Strontianite

Formula:

SrCO3

Crystal Data:

Crystal System: Orthorhombic - Dipyramidal

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

Cell Data:

Space Group: Pmcn, a = 5.107, b = 8.414, c = 6.029, Z = 4

Using the mouse (click here for more information)

Density (calc.) = 3.78 and V = 259.07 Å3

Element color: Sr, C, O
Strontianite sample
Strontianite

Sample no. 5432 from the "Mineralogy and Petrography Museum Grigore Cobălcescu" of "Alexandru Ioan Cuza" University, Iaşi.

Origin: Drensteinfurt – Germany.




Click image to enlarge

Raman spectrum and vibrations of Strontianite
Element color: C, 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 strontianite (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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Background color:
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Vibrations:
700 cm-1 - ν4b (E') 1069 cm-1 - ν1 (A'1) 1445 cm-1 - ν3a (E') 1543 cm-1 - ν3b (E')

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Download spectrum:
Raman spectrum .txt Raman spectrum .spc


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Interpretation of Raman spectrum of Strontianite

The characteristic Raman band due to the external vibration mode (M-CO3) at 242 cm-1, and the ν1 internal mode (symmetric stretching) at 1069 cm-1 are easily distinguished. In the Raman spectrum of the strontianite sample don't have values below 200 cm-1 because the spectral range is between 200-3400 cm-1.

This spectrum is governed by the very strong Raman line (1069 cm-1) atributed to the ν1 symmetric stretching mode of the carbonate group. The ν4 mode of CO3 has values at 700 cm-1. The ν2 vibration mode is not observed in this study; ν3 vibration are observed at 1445 and 1543 cm-1.

The frequencies of all Raman bands observed in Strontianite, Aragonite and Witherite can not be corelated with the atomic masses of the cations.


Buzgar et al., 20091 Krishnamurti, 1960 Assignment
242 246 T(Sr,CO3)
700 701
711
ν4 symmetric deformation
NO 855 ν2 asymmetric deformation
1069 1074 ν1 symmetric stretch
1445
1543
1408
1438
1447
ν3 asymmetric stretching

NO = not observed.
References

• The Mineralogy Database [link]

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

1BUZGAR N., APOPEI A. I. (2009) - The Raman study on certain carbonates. Analele Stiintifice ale Universitatii “Al. I. Cuza” - Iasi, Tome 55, issue 2, 97-112 [link]

• KRISHNAMURTI D. (1960) - The Raman spectra of aragonite, strontianite and witherite. Indian Academy of Sciences [link]