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American Mineralogist; April 2008; v. 93; no. 4; p. 591-597; DOI: 10.2138/am.2008.2610
© 2008 Mineralogical Society of America
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The crystal chemistry of Fe-bearing sphalerites: An infrared spectroscopic study

Allan Pring1,2,*, Serena C. Tarantino3, Christophe Tenailleau1, Barbara Etschmann1, Michael A. Carpenter4, Ming Zhang4, Yun Liu5 and Ray L. Withers5

1 Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
2 School of Chemistry, Physics and Earth Sciences, The Flinders University of South Australia, GPO Box 2100 Adelaide, South Australia 5000, Australia
3 Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, 27100 Pavia, Italy
4 Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, U.K.
5 Research School of Chemistry, Australian National University, Canberra, ACT, 0200, Australia


Figure 1
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  		FIGURE 1. Plot of cell parameter vs. FeS content for synthetic (solid diamonds) and natural (open circles) sphalerites. Solid line represents the trend from Barton and Toulmin (1966). Cell parameter of ZnS from Skinner (1961).

 

Figure 2
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  		FIGURE 2. Room-temperature IR powder absorption spectra of natural Fe-bearing sphalerites between 150 and 600 cm–1. Composition expressed as mol% FeS in ZnS.

 

Figure 3
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  		FIGURE 3. Room-temperature IR powder absorption spectra of synthetic Fe-bearing sphalerites between 150 and 700 cm–1. Composition expressed as mol% FeS in ZnS.

 

Figure 4
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  		FIGURE 4. Fitting of sphalerite (Zn0.84Fe0.16S) IR spectrum, {chi}2 = 0.004.

 

Figure 5
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  		FIGURE 5. Variation in frequency of peaks positions as a function of mole fraction of FeS (same symbols as in Fig. 1Go). Bottom: Peak A; middle: Peak B; top: Peak C.

 

Figure 6
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  		FIGURE 6. Variation in peaks amplitudes ratio as a function of mole fraction of FeS in ZnS. Top: amplitude Peak A/amplitude Peak B; bottom: amplitude Peak C/amplitude Peak B.

 

Figure 7
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  		FIGURE 7. Evolution of {Delta}corr,300 with FeS content calculated for the peak around 300 cm–1. A linear baseline was subtracted from all the spectra. The average linewidth from peak fitting is also shown. Circles = natural samples; diamonds = synthetic; open symbols = peak fitting; solid symbols = autocorrelation data.

 




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