#182

P6₃22

Example – Calciotantite, Ca(Ta,Nb)₄O₁₁

Named for its composition (Calcium, Tantalum).

Ta-Nb order in the crystal structure of niobium-rich calciotantite

Cooper M A, Hawthorne F C, Cerny P
The Canadian Mineralogist 37 (1999) 1289-1294

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

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=06204.cif&down=cif

Ta/NbO6 distorted ocahedra (purple)
Ca (blue)

 

3D rotatable model of Calciotantite

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