1983 年 16 巻 1 号 p. 111-117
An instructive lecture is delivered for mineralogists who intend to devote themselves to or are engaged in the technology of relevant fields. The brief history is given on developments of single crystal devices for optics as well as those for ferromagnetic, ferroelectric and ferroelastic (ferroic) usages. It is emphasized, for the survival of the mineralogists in fields of industry, they should understand functions of physical properties and mechanisms of interactions in addition to their knowledge of symmetry and structure of crystals.