#74

Imma

Example – Weberite, Na₂MgAlF₇

Named for Theobald C. F. Weber (1823-1886), one of the founders of the cryolite industry in Denmark.

Re-examination of the crystal structure of weberite, Locality: Ivigtut, Greenland

Giuseppetti G , Tadini C ,
Tschermaks Mineralogische und Petrographische Mitteilungen, 25 (1978)

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

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=19501.cif&down=cif

AlF6 octahedra (blue)
MgF6 octahedra (orange)
Na (yellow)

3D rotatable model of Weberite

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