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

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{Mg3(1-1/m)[Si2O5](OH)1+3(1-2/m}) with a minor amount of chrysotile. Two favourite samples (PxA, Px1-1), chosen for research on Fe 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.     

研究硫化物中不可见金赋存状态的新途径

本文根据金的晶体化学特点,将不可见金在硫化物中的赋存状态划分为三种晶体化学模式:①类质同象金;②自然元素金;③化合物金。在此基础上,提出采用以~(197)Au穆斯堡尔谱学方法为主,适当配用其他手段为辅;通过研究不可见金在硫化物中的晶体化学模式的新途径,来探索达到查明其赋存状态的目的。