THE RELATIONSHIP BETWEEN CONTENT, VALENCE STATE OF Fe AND COLOUR IN XIUYAN JADE

Qiu Zhaoming，

Rang Mei，

Huang Junjie

Nuclear Science and Techniques

Vol.3, No.2

pp.126-130

Published in print 01 May 1992

28700

Having beautiful colours and fine features, Xiuyan jade is famous in the world. Mineralogically, Xiuyan jade is serpentine jade. XRD, IR and TEM studies indicate that the jade consists mainly of antigorite (m{Mg_3(1-1/m)[Si₂O₅](OH)_1+3(1-2/m}) with a minor amount of chrysotile. Two favourite samples (P_xA, P_x1-1), chosen for research on ⁵⁷Fe Mossbauer spectra, are only antigorite. Studies indicate that: a. iron ion in antigorite enters the lattice as impurity; b. Fe²⁺ and Fe³⁺ substitute for Mg in the coordination octahedron; and c. the colour of jade is related to content of Fe, and Fe²⁺/Fe³⁺ ≤ 1 is favourite for colour-forming.

Xiuyan jadeAntigoriteMössbauer spectra

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