THE STRUCTURE OF ACUMINITE, A STRONTIUM ALUMINUM FLUORIDE MINERAL

被引：3

作者：

ANDERSEN, EK ^{[1
]}

PLOUGSORENSEN, G ^{[1
]}

LEONARDSEN, E ^{[1
]}

机构：

[1] UNIV COPENHAGEN,INST MINERAL,OSTERVOLDGADE 10,DK-1350 COPENHAGEN K,DENMARK

来源：

ZEITSCHRIFT FUR KRISTALLOGRAPHIE | 1991年 / 194卷 / 3-4期

关键词：

MINERAL; STRONTIUM ALUMINUM FLUORIDE; CRYSTAL STRUCTURE; ACUMINITE;

D O I：

10.1524/zkri.1991.194.3-4.221

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

An X-ray diffraction study of single crystals of acuminite, a strontium aluminum fluoride mineral from Ivigtut, Greenland [SrAlF4(OH).H2O, a = 13.223(1) angstrom, b = 5.175(1) angstrom, c = 14.251(1) angstrom, beta = 111.61(2), C2/c, Z = 8, D(m) = 3.295 g cm-3, D(c) = 3.305 g cm-3] used 2138 diffraction intensities (CAD-4 diffractometer), and was refined to R (unweighted) = 0.069. The strontium ions are 9-coordinated to 7 fluoride ions and 2 water molecules, the aluminium ions have octahedral coordination, 4 fluoride ions and 2 hydroxyl ions. The structure of acuminite is compared with the structure of tikhoenkovite another modification of SrAlF4(OH).H2O.

引用

页码：221 / 227

页数：7