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The crystal structure of fluorite, CaF2

Wikipedia: Calcium fluoride, Fluorite
Housecroft: p. 168
Shriver & Atkins: pp. 86–87
Smart & Moore: pp. 35 37
Greenwood & Earnshaw: pp. 117–118

The fluorite structure is the ideal structure of calcium fluoride, CaF2.

The structure can be envisaged as a cubic "close packed" array of cations with all tetrahedral holes filled by anions.

Ca2+ is cubically coordinated by eight F, whereas F is tetrahedrally coordinated by four Ca2+.

Based on template by A. Herráez as modified by J. Gutow
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