Mössbauer spectra study on Xiu-Yan Jade

• DOI: 10.1007/bf02397500
• Publication Date: 2006-05-11T16:16:23Z
• Authors: Zhaoming Qiu; Mei Rang; Junjie Huang
• Keywords: Jade; Favourite; Quadrupole splitting

Having beautiful colours and fine features, Xiu-Yan Jade is famous in the world. Mineralogically, Xiu-Yan Jade is serpentine jade. XRD, IR and TEM study indicate that the jade consists mainly of antigorite (m{Mg3(1−1/m)[Si2O5](OH)1+3(1−2/m)}) with a minor amount of chrysotile. Two favourite samples (PXA, PX1−t) are chosen for research on57Fe Mossbauer spectra. Two sets of quadrupole doublets are obtained from the spectra, The parameters of two samples, 1. 124 mm/s and 1. 119 mm/s of I. S. and 2. 732mm/s and 2. 716mm/s of Q. S. for Fe2+ in the octahedral and 0. 364mm/s and 0. 351mm/s of I. S. 0. 632 and 0. 546mm/s of Q. S. for Fe3+ in the octahedral, are only antigorite. Studies indicate that: (1) iron—ion in antigorite enters the lattice as impurity: (2)Fe2+ and Fe3+ substitute for Mg in the coordination octahedron: and (3) the colour of jade is related to content of Fe, and Fe3+/Fe2+≤1 is favourite for colour—forming.