The bismuth triiodide (BiI3) crystal structure type
Wikipedia: Bismuth(III) iodide
Housecroft: p. 462, 698
Shriver & Atkins: p. 359
Smart & Moore: p. 40
Greenwood & Earnshaw: p. 559
The bismuth triiodide structure can be thought of as a hexagonal close packed array of anions, with one third of the octahedral holes filled: layers alternating between empty and two-thirds filled by cations.
Every anion is surrounded by two cations and has bent coordination geometry. Every cation is approximately octahedrally coordinated by six anions.
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