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Aperiodic Crystals: From Modulated Phases To Quasicrystals: Structure And Properties (International Union Of Crystallography Mon-new Fu Callahan Takes Us Up CloseUntil The 1970S All Materials Studied Consisted Of Periodic Arrays Of Unit Cells, Or Were Amorphous. A New Class Of Solid State Matter Called Aperiodic Crystals Has Since Been Uncovered. It Is A Long Range Ordered Structure, But Without Lattice Periodicity. It Is Found In A Wide Range Of Materials: Organic And Anorganic Compounds, Minerals (Including A Substantial Portion Of The Earths Crust), And Metallic Alloys, Under Various Pressures And