Man's first experience with the ordered state of matter to which we now apply the generic term "crystals" came about when he found specimens of some of the natural crystalline mineral substances that are re latively common in the surface and near-surface areas of the earth's crust. His first widespread use of these natural materials in which their crystalline nature was of importance was undoubtedly in fabricating jewelry and otherwise adorning his weapons, tools, and household items. Both the Old and New Testa ments of the Bible document the use of crystalline gems, and the Romans are...