DETERMINATION AND REFINEMENT OF THE CRYSTAL STRUCTURE OF CHAIDAMUITE

Chaidamuite (ZnFe(SO_4)_2(OH). 4H_2O), which is a new sulphate mineral, belongs to the triclinic system, space group P1, with the cell parameters corrected by the least-squares method: a=7.309(2), b=7.202(2), c=9.691(3), α=89.64(3), β=105.89(3), γ=91.11(2)°, Z=2. The crystal structure has been determined by the Patterson method and Fourier syntheses and refined by the full-matrix least-squares method to an R factor of 0.032, using 2833 independent reflections. In the structure, a zigzag chain consists of [Fe(1)O_5(OH)] and [Fe(2)O_5(OH)] octahedra sharing the OH corners, and an octahedral-tetrahedral chain running parallel to the b axis consists of the zigzag chain of Fe octahedra and (SO_4) tetrahedra sharing four pairs of octahedral corners on either side of the zigzag chains. These chains are cross-linked by the isolated [Zn(1)O_2(H_2O)_4] and [Zn(2)O_2(H_2O)_4] octahedra into corrugated sheets parallel to the (100) plane. Adjacent sheets are hydrogenbonded through water molecules.     

柴达木石晶体结构测定和精确化

新矿物柴达木石(ZnFe(SO_4)_2(OH)·4H_2O)属三斜晶系,空间群P1.最小二乘法修正的晶胞参数:a=7.309(2) ,b=7.202(2) ,c=9.691(3) ,α=89.64(3)°,β=105.89(3)°,γ=91.11(2)°。晶体结构经Patterson法和Fourier合成法测定;2833个独立衍射全矩阵最小二乘修正,R因子为0.032。结构中,[Fe(1)O_5(OH)]和[Fe(2)O_5(OH)]两种配位八面体通过共用OH角顶,组成‘Z’字形链;链的这一侧和另一侧的4对八面体角顶被[SO_4]四面体共用。这种八面体-四面体链又被孤立的[Zn(1)O_2(H_2O)_4]和[Zn(2)O_2(H_2O)_4]八面体连接成平行(100)面的波状层;层间通过水分子以氢键相连。     

铁镁明矾的拉曼和红外光谱

铁镁明矾的拉曼和红外光谱毛延哲，曾维杨（兰州大学物理系兰州７３００００）李万茂，李学军（兰州大学地质系兰州７３００００）ＲａｍａｎａｎｄＩｎｆｒａ－ｒｅｄＳｐｅｃｔｒａｏｆｔｈｅＦｅ－ｐｉｃｋｅｒｉｎｇｉｔｅ￥ＭａｏＹａｎｚｈｅａｎｄＺｅｎｇＷｅｉｙ...     

李时珍石的红外与拉曼光谱

李时珍石是一种硫酸盐新矿物，理想分子式为：ＺｎＦｅ＿２（ＳＯ＿４）＿４·１４Ｈ＿（２）Ｏ。属三斜晶系。空间群Ｐ，Ｚ＝１。本文首次报导它的拉曼光谱，并结合红外光谱，以及与它的类质同象物─—粒铁矾的振动光谱对照，对李时珍石的振动光谱的主要谱带的归属作了探讨。