Color Genesis and Compositional Characteristics of Color-Change Sapphire from Fuping, China

The color-change sapphire occurs in sillimanite-biotite gneiss Fuping County Hebei province, China, is one of most famous deposits China. However, the color genesis, mechanisms changing and compositional characteristics remain enigmatic. In this contribution, coloration sapphire, and, were studied by conventional gemological instruments conjunction with ultraviolet-visible spectroscopy Laser ablation inductively coupled plasma mass spectrometer. results show that characterized purple-blue-to-purple-red changed effect column-shaped, waist drum-shaped higher degree euhedral crystal. Reddish brown rutile inclusions 120° crossed cleavage are commonly observed. dominant coloring element Fe3+, subordinate elements Fe2+, Cr3+ V3+. caused trace chemical compositions sapphires analogous to those metamorphic blue sapphires. When geochemically compared from Isalo/Ilakaka deposit Madagascar, Ratnapura Sri Lanka Mogok Myanmar, have distinctly rare contents Fe, Cr Ga.