Hexagonal close packed (hcp)
Hexagonal close packed (hcp): a unit cell in which two hexagons (six-sided shapes) form the top and bottom of the prism. An atom is located at the center and at each point of the hexagon. Three atoms, one at each point of a triangle, are located between the top and bottom hexagons. Among the common hcp metals are zinc, cadmium, and magnesium.
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