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




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


3D rotatable model of NaKAl2Si2O6

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