Study on the Color-Influencing Factors of Blue Iolite

This article explores the factors that influence color of blue iolite, which is gem-quality variety cordierite mineral. The X-Rite SP62 portable spectrophotometer was used to measure in CIELAB space. ED-XRF and UV–vis were for analysis. results show iolite contains chromophore elements Fe Mn, but effect on not significant due low Mn content. lightness L* hue angle h° are mostly determined by its spectra has a broad absorption band near 570 nm caused charge transfer between Fe2+ octahedron Fe3+ T11 tetrahedron iolite. Each different standard light source degrees parameters most influenced.