#173

P6₃

Example – Nepheline, NaKAl₂Si₂O₆

From the Greek nephele, “cloud,” because it becomes clouded when put in strong acid.

The Structure of Nepheline

Buerger M J, Klein G E, Hamburger G E
American Mineralogist 32 (1947) 197-197

http://www.webmineral.com/data/Nepheline.shtml

CIF
http://rruff.geo.arizona.edu/AMS/download.php?id=00112.cif&down=cif

K (purple)
NaO7 polyhedra (green)
SiO4 tetrahedra (orange)
AlO4 tetrahedra (blue)

 

3D rotatable model of NaKAl₂Si₂O₆

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