Mössbauer spectra study on Xiu-Yan Jade |
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Authors: | Zhaoming Qiu Mei Rang Junjie Huang |
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Affiliation: | (1) Changchun University of Earth Sciences, 130061 Changchun, China;(2) Antarctic Research Center, CAGS, 210016 Nanjing, China |
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Abstract: | 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 Mössbauer 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. |
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