#144
P31
Example – Stillwellite-Ce, (Ce,La, Ca)SiBO5
Named for Frank Leslie Stillwell (1888-1963), Australian ore mineralogist and the dominant Ce content.
The crystal structure of Stillwellite
Burns P C, Hawthorne F C, MacDonald D J, Ventura G D, Parodi G
The Canadian Mineralogist 31 (1993) 147-152
http://www.webmineral.com/data/Stillwellite-(Ce).shtml
CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=18362.cif&down=cif
SiO4 tetrahedra (orange)
BO4 tetrahedra (pink)
The Fascination of Crystals and Symmetry 