This book surveys important stone properties, both physical and chemical, pertinent to the needs of architects, engineers and stone producers. Emphasis is placed on the chemical characteristics of the pollutants in air and water and their interaction with stone, which accelerates the process of stone decay, often many times faster than in rural locations in quarries or rock cuts. Graphs and diagrams, the scientist's language, analyze and quantify the natural processes which lead to stone decay: simplification of the graphs enhances their legibility not only for the student of geology, environmental science, engineering, but also for the museum curator and conservator who deal with stone monuments. Only thorough knowledge of stone properties and processes can lessen their frequent misuse and the present decay of urban stone, thus enabling its prevention with preservatives. The book also provides information for the stone producer and consumer for a better understanding of the product stone.