#156

P3m1

Example – Fencooperite, Ba₆Fe₃Si₈O₂₃(CO₃)₂Cl₃ • H₂O

Named for Joseph Fenimore Cooper, Jr. (1937-), mineral collector of Santa Cruz, California, USA.

The crystal structure of fencooperite: Unique [Fe³⁺₃O₁₃] pinwheels cross-connected by [Si₈O₂₂] islands

Grice J D
The Canadian Mineralogist 39 (2001) 1065-1071

 

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=06296.cif&down=cif

 

Ba (blue)
FeO5 tetragonal pyramids (dark red)
SiO4 tetrahedra (orange)
CO3 trigonal planer units (black)
Cl (green)

 

3D rotatable model of Fencooperite