Structure refinement of astrophyllite

作     者：马喆生 李国武 施倪承 周湖云 叶大年 D.YU.PUSHCHAROVSKY Ma Zhesheng;LI Guowu;Shi Nicheng;ZHOU Huyun;YE Danian;D.YU.PUSHCHAROVSKY

作者机构：China University of GeosciencesBeijing 100083China Southwest Institute of TechnologyMianyang 621002China China University of GeosciencesBeijing 100083China Institute of GeologyChinese Academy of SciencesBeijing100029China Department of GeologyMoscow State UniversityMoscow 119899Russia 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2001年第44卷第6期

页      面：508-516页

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：in part by The National Natural Science Foundation of China (Grant No. 49872019) and Russian Scientific Foundation (Grant No. 99-05-35019) 

主　　题：astrophyllite crystal structure functional substitution 

摘      要：The crystal structure of astrophyllite K2Na(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 K2NaNa(Fe, Mn)4Mg2Ti2[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.