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About
Hexagonal close packing (hcp): the other densest sphere packing, with ABAB stacking and twelve nearest neighbours. The structure of about a quarter of the metallic elements.
Structure
PrototypeMg (A3)
Crystal systemhexagonal
Space groupP6_3/mmc (194)
Latticea = 3.2094, b = 3.2094, c = 5.2105 Å
Anglesα 90° · β 90° · γ 120°
Elements
Also crystallizes this way
ZnTiCoCdBe
Sources
- Structure: Crystallography Open Database (COD)
- Lattice parameters: Wyckoff, Crystal Structures — a = 3.209 Å, c = 5.211 Å