#66

#66

Cccm

Example – Cordierite, Mg2Al4Si5O18

From the French mining engineer and geologist P. L. A. Cordier (1777-1861).

The polymorphism of cordierite I: The crystal structure of low cordierite

Gibbs G V
American Mineralogist, 51 (1966) p.1068-1087

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

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=00218.cif&down=cif

Cordierite

SiO4 tetrahedra (orange)
AlO4 tetrahedra (blue)
Mg/Fe green/brown
H2O/Li/Na/K in the centres of the channels running along the c axis

3D rotatable model of Cordierite

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