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Optical absorption spectra of natural Co-bearing spinel and staurolite were studied at different temperatures and pressures. In both minerals, two broad, intense structured bands in the range 5500-8000 and 15 000-19 000 cm-1, caused by electronic spin-allowed transitions  4 A 2  →  4 T 1 (4F) and  4 A 2  →  4 T 1 ( 4 P) of  IV Co 2+  are the predominant absorption features. In addition, in both cases broad bands, derived from spin-allowed electronic transitions 4E → 4T2 of  IV Fe 2+ , appear in the near infrared range partly overlapping the bands caused by  IV Co 2+ . In staurolite the NIR range of the spectra are complicated by intense sharp lines of OH-vibrations at around 3400 cm -1 .

Optical spectroscopic study of tetrahedrally coordinated Co 2+ in natural spinel and staurolite at different temperatures and pressures