Monthly Archives: July 2014

#100

#100

P4bm

Example – Na0.5Bi0.5TiO3

Investigation of the structure and phase transitions in the novel A-site substituted distorted perovskite compound Na0.5Bi0.5TiO3

Jones, G.O.; Thomas, P.A.
Acta Cryst. B (2002) 58, 168-178

CIF
https://www.dropbox.com/s/t3deu9mgrr0pheu/icsd_280984.cif

Na0.5Bi0.5TiO3

TiO6 octahedra (blue)
Na/Bi (yellow/green)

3D rotatable model of Na0.5Bi0.5TiO3

#97

#97

I422

Example – Ekanite, ThCa2Si8O20

Named for F.L.D. Ekanayake, of Colombo, Sri Lanka, who discovered the mineral.

A mineralogical study and crystal-structure determination of nonmetamict ekanite, ThCa2Si8O20

Szymanski J T, Owens D R, Roberts A C, Ansell H G, Chao G Y
The Canadian Mineralogist 20 (1982) 65-75

http://webmineral.com/data/Ekanite.shtml

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=05678.cif&down=cif

Ekanite

SiO4 tetrahedra (yellow)
ThO8 polyhedra (green)
CaO8 polyhedra (blue)

3D rotatable model of Ekanite

#96

#96

P43212

Example – Li(AlSi2O6)

Framework distortion by large ions in MAlSi2O6 aluminosilicates with keatite structure

Baumgartner, B.; Mueller, G.
European Journal of Mineralogy (1990) 2, 155-162

CIF
https://www.dropbox.com/s/09x3r4hxenbzykx/icsd_69394.cif

Li(AlSi2O6)

Al/SiO4 tetrahedra (orange)
Li (blue)

3D rotatable model of Li(AlSi2O6)