Gahnite - IR Reflectance spectra Gahnite Index IR-Reflectance Photoluminescence UV-Vis-NIR Blue: Blue gahnite – 2.02 ct crystal – Kagoro Hills, Kaduna State, Nigeria Green: Dark-green gahnite – 0.24 ct crystal – Pico Das Almas River, Paramirim Das Crioulas, Erico Cardoso, Bahia, Brazil Blue gahnite – 2.02 ct crystal – Kagoro Hills, Kaduna State, Nigeria Dark-green gahnite – 0.24 ct crystal – Pico Das Almas River, Paramirim Das Crioulas, Erico Cardoso, Bahia, Brazil
