Pb SO4
Anglesite is a lead mineral (lead sulphate) named after the original locality in the Isle of Anglesey where it was found. Anglesite is colourless when it is very pure. It crystallises in an orthorhombic lattice and the space group D2h16 (Pnma) 1. In anglesite, the cation Pb is surrounded by twelve oxygen atoms belonging to seven different SO4 molecules 2.
The fundamental vibrational modes of the SO4 molecule are known as four distinct internal modes, i.e. one non-degenerate mode v1, one doubly degenerate mode v2, and two triply degenerate modes v3 and v4. The IR spectrum of anglesite has two strong bands v3 and v4, and one weak band v1 2. There is a significant disagreement among reported spectra for anglesite. While two references found band at 960 cm-1 assigned to v1 2,3, only Farmer 3 observed the v2 vibrational mode at 435 cm-1. The vibrational mode v3 is reported to have bands at 1165, 1105 and 1045 cm-1 2, while Farmer 3 found these bands at 1163, 1047 and 1000 cm-1. Similarly, the vibrational mode v4 is shown at 620 and 592 cm-1 2, but has also been reported at 650, 597 and 592 cm-1 3. Anglesite bands are also found in the far infrared region at 185, 150, 120, 104 and 73 cm-1 2.
The strongest band in the Raman spectrum of anglesite occurs at 981 cm-1. Other weaker bands are resolved at 1162, 1068, 1057, 649, 621, 611, 454, 443 and 190 cm-1 4.
1. Nikolic, P. M., Mihajlovic, P., & Todorovic, D. M. (1996). Far infrared and infrared properties of single crystal anglesite. Spectrochim. Acta, Part A, 52A(2), 131-137.
2. Omori, K. (1968). Infrared diffraction and the far infrared spectra of anhydrous sulfates. Mineralogical Journal, 5(5), 334-354.
3. V.C. Farmer, 1974 Infrared spectra of minerals in Mineralogical Society Monograph 4 VC Farmer (Ed) pp 427. Mineralogical Society, London.
4. Griffith, W.P. (1970) Raman studies on rock-forming minerals. II. Minerals containing MO3, MO4 and MO6 groups. J. Chem. Soc. A(2), 286-91.
SELECTED REFERENCES ON SPECTROSCOPY OF
ANGLESITE:
1. Omori, K. (1968). Infrared diffraction and the far infrared spectra of anhydrous sulfates. Mineralogical Journal, 5(5), 334-354.
2. V.C. Farmer, 1974 Infrared spectra of minerals in Mineralogical Society Monograph 4 VC Farmer (Ed) pp 427. Mineralogical Society, London.
3.
J.A. Gadsden 1975. Infrared spectra of minerals and related inorganic
compounds. Butterworths, London. Pp96.
4. Griffith, W.P. (1970) Raman studies on rock-forming minerals. II. Minerals containing MO3, MO4 and MO6 groups. J. Chem. Soc. A(2), 286-91
Original
spectra shown for this mineral can be obtained on request from J.T. Kloprogge
(E-mail t.kloprogge@qut.edu.au), or
R.L. Frost (E-mail r.frost@qut.edu.au).
Postal
address:
Centre
for Instrumental and Developmental Chemistry, Queensland University of
Technology, GPO Box 2434, Brisbane, Qld 4001, Australia.
Fax +61
7 3864 1804
For more information see our general website at: http://www.sci.qut.edu.au/sci_schps.html
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