#62
Pnma
Example – Avogadrite, KBF4
Named for Amedeo Avogadro (1776-1856), Professor of Physics at the University of Turin, Turin, Italy.
The crystal structure of KBF4
Brunton G
Acta Crystallographica B25 (1969) 2161-2162
http://webmineral.com/data/Avogadrite.shtml
CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=10351.cif&down=cif
BF4 tetrahedra (blue)
Pottasium (purple)
The Fascination of Crystals and Symmetry 