This book deals with the mysteries of geology. The basic concepts about solid mineral materials, symmetry and its elements, single crystals, intergrowths and twins, and habitual and simple crystallographic forms, which manifest themselves both in the outward appearance and in the external atomic structure of minerals are presented in this book. This book is the result of many years of the author's studies on an interesting mineral assemblage in sulphate-carbonate rocks. The problems, connected with the specifics of calcium sulphate conversion to sulphur and calcite, are discussed in the book. The reader is acquainted with the marble onyx secret and with the secrecy of Egyptian pyramids long- living. It is intended for geologists, students, and lovers of stones.