Sugilite Spectra (350 - 1100 nm)

The origin of pink color in sugilite, KNa2Fe3+2(Li3Si12)O30, is it's managanese (Mn3+) content substituting for ferric iron. Larger pieces are often purple, but when polished thin and examined in the regions that are pure sugilite, they are pink.

Link to references about the spectra of sugilite

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