Octahedral

a.

1.

Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage; an octahedral crystal. Octahedral borax (Chem.) borax obtained from a saturated solution in octahedral crystals, which contain five molecules of water of crystallization; distinguished from common or prismatic borax. Octahedral iron ore (Min.) magnetite.