hexagonal close-packed structure

hexagonal close-packed structure

[hek′sag·ə·nəl ¦klōs ¦pakt ′strək·chər]
(crystallography)
Close-packed crystal structure characterized by the regular alternation of two layers; the atoms in each layer lie at the vertices of a series of equilateral triangles, and the atoms in one layer lie directly above the centers of the triangles in neighboring layers. Abbreviated hcp structure.
References in periodicals archive ?
The new data suggest that the core could be either one gargantuan crystal of silicon-tainted iron with a hexagonal close-packed structure or a blend of iron-rich minerals that includes body-centered cubic crystals.