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




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


3D rotatable model of Fencooperite


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