层状硅酸盐矿物晶体结构的多体性组装模式与构筑原理

POLYSOMATIC MODULES AND ASSEMBLING PRINCIPLE FOR CRYSTAL STRUCTURES OF PHYLLOSILICATES

将层状硅酸盐矿物晶体结构中属性不同的二维结构单元体看成是不同的结晶学模块,研究了一般层状硅酸盐矿物和间层矿物的多体性组装模式和构筑原理。结果表明,不同二维结构单元体(包括硅氧四面体片、八面体片、层间域(物))的构筑基本符合球体紧密堆积原理,紧密堆积层平行{0001};四面体片与八面体片构筑TO和TOT结构层时采取多种机制消除二者在二维尺寸上的差异;两种模式的结构层与不同类型的层间物(域)组装形成六种组装模式的晶层;并通过二维结构单元体的组合规律的分析,计算出可能存在的28种TOT型间层结构,它们分属于6种间层结构多体性组装模式;间层结构中,结构层对于八面体片是不对称的,并在属性上表现出极性特征;间层矿物的晶层类型可用6种多体性组装模式加以表达。层状硅酸盐矿物结构的多体性分析与组装模式的研究,对于矿物晶体化学研究是非常重要的。

Regarding the different two-dimensional structural units in phyllosilieate as the elementary building modules, polysomafie modules and assembling principle for crystal structures of phyllosilieates including interstratified minerals are discussed. The two-dimensional structural units （such as silicon-oxygen tetrahedral sheet, oetahedral sheet）, interlayer space （or interlayer matter） are assembled according to the sphere close packing manner, and the close packing layers parallel to {0001 } . There are several mechanisms to release the difference in size while the silicon-oxygen tetrahedral sheet and octahedral sheet assemble the TO and TOT-type structural layers. The two types of structural layers with different interlayer space （or interlayer matter） fitted together in six kinds of assembling modes and formed six kinds of crystal layers. The combinatorics analysis of the two-dimensional structural traits revealed that there may be 28 kinds of TOT type interstradified minerals in six kinds of polysomatie assembling modes of interstradified structure. The structural layer is symmetrical for octahedron sheet in the structure of interstratified minerals and shows polarity characteristics. The crystallayer types of interstratified minerals are expressed in the six types of polysomatie assembling modes.