河北涞源墨铜矿透射电镜研究

墨铜矿的结构属三方面晶系，为典型的异类矿物结构基元层间层矿物。结构以硫化物层（Ｃｕ，Ｆｅ）Ｓ和似水镁石层（Ｍｇ，Ｆｅ）（ＯＨ）２呈规则交互而构成。

Studies on TEM of Valleriite ,Laiyuan ,Hebei Province ,China

Valleriite belongs to trigonal mineral with the characteristics of in-.terlayering sulfideCu , Fe)S and brucite(Mg , Fe)(OH)_2 layers. Previous study proposes a superlattice hypothesis both on the c-and a-axes due to the mismatch of the sulfide and brucite lattices, The size of the superlattice depends on the value of mismatch of the two sub-unit cells. However TEM study on valleriite shows that it is of textural structure with no indication of presence of superlattice diffractions on a-axis, nor on c-axis. Along c-axis valleriite presents ruther well orderd in-terlayering properties,showing a strong 1. 14nm reflection , whereas along a-axis splits streaks of reflections occurred , indicating mis-orientation of brucite arrangement with respect to sulfide. Valleriite is formed as the result of the al-teration of pyrite or chalcopyrite with the initial process of forming about 10nm size micro-crystals of (Cu, Fe)S sumdes. Later those micro-crystals of sulfides react with serpentines to obtain brucite layers to finally producing valleriite.