#77
P42
Example – Pinnoite, MgB2O4 • 3 H2O
Named for chief councilor of Mines, Pinno, of Halle, Germany.
A note on the structure of pinnoite
Krogh-Moe J.
Acta Crystallographica, 23 (1967) p.500-501
http://webmineral.com/data/Pinnoite.shtml
CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=10296.cif&down=cif
BO4 tetrahedra (pink)
MgO4 octahedra (green)
The Fascination of Crystals and Symmetry 