title: Evidence from electron micrographs that icosahedral quasicrystals are icosahedral twins of cubic crystals.
abstract: An analysis of electron micrographs of Al5Mn quasicrystals obtained by rapidly cooling a molten alloy with composition Al17Mn and removing the Al matrix by electrosolution, revealing aggregates of 20 microcrystals at the corners of a pentagonal dodecahedron, supports the proposal that these microcrystals are cubic crystals twinned about an icosahedral seed, with each cubic microcrystal sharing a threefold axis and three symmetry planes with the seed.
authors.affiliation: Linus Pauling Institute of Science and Medicine, Palo Alto, CA 94306, USA.
authors.forename: L
authors.initials: L
authors.lastname: Pauling