Amphibole Visible Spectra (generally 350 - 2500 nm)

Amphiboles absorb light primarily because of Fe2+ in the M1,M2,M3 and M4 sites, Fe3+, Cr3+, and V3+ in the M2,M1 and M3 sites, and the Fe2+ - Ti4+ or the Fe2+ - Fe3+ intervalance charge transfer. 

          Spectra with multiple origins

        Spectra dominated by manganese  

        Poorly defined spectra in a Ti4+-rich amphibole

Link to an extensive collection of references to mostly color and visible spectroscopy of amphiboles

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revised 27-Aug-2022