Crystalline solution series and order-disorder within the natrolite mineral group
Crystalline solution series and order-disorder within the natrolite mineral group
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钠沸石矿物组内的结晶溶液系列和有序无序
DOI：
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发表时间：
1992
期刊：
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通讯作者：
D. R. Ross
中科院分区：
文献类型：
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作者：
M. Ross;M. Flohr;D. R. Ross
钠沸石族的沸石矿物（钠沸石、四钠沸石、副钠沸石、中沸石、菱沸石、透辉沸石、钠沸石、硬硅钙石和四硬硅钙石）具有通式（Na，Ca，Ba）r-，6（Al，Si）00 O 8. nHrO。电子探针和X射线分析是对来自阿肯色州磁铁湾碱性火成杂岩的钠沸石、四钠沸石、角钠沸石和透辉石以及美国国家博物馆的精选标本进行的。来自文献的这些信息和数据表明，钠沸石、中沸石、菱沸石、edingtonite和tetraedingtonite仅显示出与理想化学计量的小偏差。与此相反，gonnardite，tetranatrolite，和thomsonite显示出较大的偏差，从理想的端员组合物，并组成三个结晶系列。这些是（1）由EoNa，u，Ca，Al，u*“Siro“O“0·16 HrO给出的钠石系列，其中x从大约0.3变化到3.2，tr表示骨架内通道中的阳离子空位，（2）由EoNa，u，Ca，Al，u*“Siro“O”0·16 HrO给出的四钠石系列，其中x从大约0.4变化到4，和（3）由EoNa，u，Ca，Al，u*“Siro”O“0·16 HrO给出的透红沸石系列，24 H2O，其中：c在约0至2之间变化。钠沸石矿物的结构由AlOo和SiOo四面体的链组成，这些四面体以三种方式之一连接以形成钠沸石、透闪石或埃丁顿石型框架。骨架内通道被NaOo（HrO）2、（Na，Ca）Oo（HrO）r、CaOo（H，O）r、CaOo（HrO）r、（Na，Ca）Oo（HrO）0或BaOu（H，O）o多面体占据。含Na多面体的边缘连接形成连续的链，而Ca和Ba多面体通过通道空位彼此隔离。钠沸石矿物的结构通过将三种类型的骨架结构中的每一种与占据通道的多面体的各种组合相结合来定义。将两种基本结构的切片结合起来，形成新的杂交结构，可以构建出各种多体系列。如果角闪石系列是由钠沸石和透闪石混合畴组成的多相系列，则可以解释角闪石的成分变化和复杂的晶体学。一个副钠石系列（troNa，.“Ca*A1，6*“Si_（24），O_（80）·24 HrO），并提出副钠沸石的结构是钠沸石骨架与通道填充的NaO_o（HrO）和（Na，Ca）O_o（HrO）_o多面体的结合。
The zeolite minerals of the natrolite g.roup (natrolite, tetranatrolite, paranatrolite, mesolite, scolecite, thomsonite, gonnardite, edingtonite, and tetraedingtonite) have the general formula (Na,Ca,Ba)r-,6(Al,Si)ooO8..nHrO. Electron microprobe and X-ray analyses were made of natrolite, tetranatrolite, gonnardite, and thomsonite from the Magnet Cove alkaline igneous complex, Arkansas, and of selected specimens from the U.S. National Museum. This information and data from the literature indicate that natrolite, mesolite, scolecite, edingtonite, and tetraedingtonits show only small deviations from the ideal stoichiometry. In contrast, gonnardite, tetranatrolite, and thomsonite show large deviations from the ideal end-member compositions and compose three crystalline series. These are (l) the gonnardite series given by E"Na,u ,,Car,Al,u*"Siro "O"o.nHrO, where x varies from approximately 0.3 to 3.2 and tr denotes a cation vacancy in the intraframework channels, (2) the tetranatrolite series given by EoNa,u "Ca,Al,u*"Sira-"Oro.l6HrO, where x varies from approximately 0.4 to 4, and (3) the thomsonite series given by EoNao*,Ca, ,A120-,Si20*"O 8o.24H2O, where:c varies from approximately 0 to 2. The structures of the natrolite minerals are composed of chains of AlOo and SiOo tetrahedra that link in one of three ways to form the natrolite-, thomsonite-, or edingtonite-type frameworks. The intraframework channels are occupied by NaOo(HrO)2, (Na,Ca)Oo(HrO)r, CaOo(H,O)r, CaOo(HrO)r, (Na,Ca)Oo(HrO)0, or BaOu(H,O)o polyhedra. The Na-bearing polyhedra are edge linked to form continuous chains, whereas the Ca and Ba polyhedra are isolated from one another by channel vacancies. The structures of the natrolite minerals are defined by combining each of the three types of framework structures with various combinations of channel-occupying polyhedra. Various polysomatic series can be constructed by combining slices of two basic structures to form new hybrid structures. The compositional variation and complex crystallography of gonnardite can be explained if the gonnardite series is a pol'ysomatic series composed of mixed domains of natrolite and thomsonite. A paranatrolite series (troNa,._"Ca*A1,6*"Si24_,O8o.24HrO) is predicted, and it is proposed that the structure of paranatrolite combines the natrolite framework with channel-filling NaOo(HrO), and (Na,Ca)Oo(HrO)o polyhedra.