Dumortierite Visible Spectra (350 - 1000 nm)

Dumortierite is commonly either blue or pinkish-lavender (or a color derived from a mixture of these two colors. The color of dumortierite is usually due to its iron and titanium content. Although the exact origin of color is still under investigation, we think that charge transfer between Fe2+ and Ti4+ causes the 500 nm band and think that the 600 nm band arises from Fe2+ - Fe3+ intervalence charge transfer. 
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last revised 2-Sep-2015