This text provides an introduction to the world of crystals. It examines how they appear in arctic seas, deserts and furnaces, around the stars, inside plants and animals, and deep within the Earth, yet they conform to only a few basic three-dimensional patterns. It examines the structure of the molecules that make them crystalline as well as examining the many uses of crystallinee materials, domestically, in industry and in science and technology, and covers developments in the field of crystallography.