莱河矿的晶畴双晶构造及其结构的再研究

DOMAIN TWINNING OF LAIHUNITE AND REFINEMENT OF ITS CRYSTAL STRUCTURE

Domain twinning of Laihunite has been investigated based on diffraction phenomenon, and its erystal structure has then been refined. Spaee group with respect to the domain is P2/b, and cell parameters a=4.812, b = 10.211, c = 5.813(A), a=90.87° Atomic coordinate and bend length have been recalculated. Diseussions are given to the Fe^2+ distribution, lattice distortion, degree of order of Laihunite and the relationship of this mineral with fayalite and ferrifayalite. The authors still hold that Laihunite should be eonsidered a new silicate mineral with dominant Fe^3+ and less amount of Fe^2+.

Domain twinning of Laihunite has been investigated based on diffraction phenomenon,and its crystal structure has then been refined.Space group with respect to the domain is P2/b,and cell parameters a = 4.812,b= 10.211,c = 5.813(A),a=90.87° Atomic coordinate and bond length have been recalculated.Discussions are given to the Fe2+ distribution,lattice distortion,degree of order of Laihunite and the relationship of this mineral with fayalitc and ferrifayalite.The authors still hold that Laihunite should be considered a new silicate mineral with dominant Fe3+ and less amount of