Scheelite CaWO₄

Unit cell

Lattice constants

a = 5.243 Å, b = 5.243 Å, c = 11.376 Å; α = 90°, β = 90°, γ = 90°

Cell volume

312.7 ų

Atoms in the cell

24 (Ca 4, W 4, O 16)

Formula units Z

4

Calculated density

6.12 g cm⁻³

Shortest contact

1.782 Å

Coordination

Ca

CN 8 at 2.44 Å (8 O)

W

CN 4 at 1.78 Å (4 O)

O

CN 1 at 1.78 Å (1 W)

About the structure

• Isolated WO₄²⁻ tetrahedra (W–O 1.78 Å) with Ca²⁺ eight-coordinate between them.
• Coordination: W 4, Ca 8 (two sets of four O at 2.44 and 2.48 Å).
• The structure type of CaMoO₄ (powellite), PbWO₄ and many laser-host tungstates; the W–O bond cutoff is used for the drawn bonds, Ca–O contacts are longer.

Atom positions (fractional, one cell)

Z, coordination numbers, distances, density and packing on this page are computed from these coordinates.