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Mineralogy and crystal structure determination of Mg-fillowite

Science china Earth Sciences 2005年第5期48卷 635-646页

作者： ma zhesheng 1 , shi nicheng 1 & ye danian 2.1. china university of geosciences, {2. 100083, china 2. Institute of Geology, Chinese Academy of Sciences, {2. 10002., china china university of {2. Beijing China Institute of Geology Chinese Academy of Sciences Beijing China

Accurate crystal structure determination of complex phosphate Mg-fillowite ? Na2.a(Mn4Mg2.e)7[PO4]6 has been finished. Mg-fillowite occurs in muscovite-pegmatite in the Altay area, Xinjiang, china. It is of the trigonal lattice, with space group R-3, unit cell a=1.5143(3) nm, c=4.3191(2. nm, V=8.5736 nm3, Z = 18. The R-factor of the determination accuracy is R (I > 2. ( I )) = 0.0776. The cationic polyhedra consist of two kinds of structural units: compound col- umn and screw column. In three-dimensional space, they are linked with each other through corner sharing or edge sharing to build the entire structure. There are 45 atoms in an asymmetric unit and 72. atoms in a unit cell. In terms of types and connection manners of the coordination polyhedra, the degree of complicity is rarely seen in all mineral crystal structures. Study of such a structure is significant for the classification of phosphate and the building rule of coordination polyhedra in a complex crystal structure.

关键词： Mg-fillowite, complex phosphate, crystal structure, coordination polyhedron.

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Structure refinement of astrophyllite

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Science china Earth Sciences 2001年第6期44卷 508-516页

作者：马喆生李国武施倪承周湖云叶大年 D.YU.PUSHCHAROVSKY china university of {2. Beijing 100083China Southwest Institute of Technology Mianyang 621002China china university of {2. Beijing 100083China Institute of Geology Chinese Academy of SciencesBeijing100029China Department of Geology Moscow State UniversityMoscow 119899Russia

The crystal structure of astrophyllite K2.a(Fe, Mn, Mg,□)7[Ti2.Si4O12.2.O3](OH, F)4 has been refined. The dimensions of the triclinic unit cell are: a = 0.5359(2. nm,b = 1.1614(4) nm, c = 1.1861(4) nm, α= 113.16(2.°, β= 103.04(2.°,γ= 94.56(2.°,V = 0.6495(5) nm3, Z= 1, space group P1, R=0.057 for 5308 reflections |Fo|>3σ|Fo|. According to structural and compositional differences the monoclinic astrophyllite K2.aNa(Fe, Mn)4Mg2.i2.Si4O12.2.OH)4(OH, F)2.and astrophyllite should be considered as two different mineral species. Astrophyllite, monoclinic astrophyllite, bafertisite and lamprophyllite contain heteropolyhedral sheets which topologically are related with Si, O sheets of mica where one or several SiO4 tetrahedra are replaced by TiO n polyhedra. Therefore this heterophyllotitanosilicate series represents a kind of functional substitution in inorganic crystals.

关键词： astrophyllite crystal structure functional substitution

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