Gahnite - UV-Vis spectra
460: MFe3+477, 559, 574 and 598: TFe2+
545, 580 and 626 nm: TCo2+
656 and 731 nm: Fe2+/3+ pairs
Dark-green gahnite – 0.24 ct crystal – Pico Das Almas River, Paramirim Das Crioulas,
Erico Cardoso, Bahia, Brazil
460 nm: MFe3+542/548, 575 and 595 nm: TFe2+
542/548, 580 and 625 nm: TCo2+
670 nm: Fe2+/3+ pairs
possible Cr3+ contribution