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

Crystal structure of Linarite

Formula:

PbCu(SO4)•(OH)2

Crystal Data:

Crystal System: Monoclinic - Prismatic

Point Group: 2/m

Cell Data:

Space Group: P 21/m, a = 9.6913, b = 5.6503, c = 4.6873, Z = 2

Using the mouse (click here for more information)

Density (calc.) = 5.32 and V = 250.43 Å3
Element color: Pb, Cu, S, O, H
Linarite sample
Linarite

Sample no. 5523 from the "Mineralogy and Petrography Museum Grigore Cobălcescu" of "Alexandru Ioan Cuza" University, Iaşi.

Origin: Cumberland - England.




Click image to enlarge
Raman spectrum and vibrations of Linarite
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 linarite (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
Symbols on Symbols off
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 Linarite

The Raman spectrum of linarite is characterized by an intense band at 967 cm-1 attributed to the ν1 mode of the sulfate group. The bands at 437 cm-1, 465 cm-1 and 518 cm-1 were assigned to the ν2 vibrational mode, the 1143 cm-1 band to the ν3 mode; and the 613 cm-1 and 634 cm-1 to the ν4 asymmetric bending.

A weak band that appears at 1021 cm-1 was assigned to the ν3 mode. The linarite spectrum presents other bands at: 232 cm-1, 347 cm-1 and 366 cm-1 due to Cu-OH / Pb-OH vibrations and at 819 cm-1 due to the possible deformation of the O-H bond.


Linarite Assignments
Buzgar et al., 20091 Lasnier, 1991
232 230 M-OH
347 345
366 370
437 430 ν2 SO4
465 460
518 505
613 612 ν4 SO4
634 630
819 OH bending
967 980 ν1 SO4
1021 1030 ν3 SO4
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]

• LASNIER, B. (1991) - Société Française de Minéralogie et de Cristallographie - Base de données de spectres Raman. [link]