This book provides a comprehensive crystal guide with concise instructions in order to give the knowledge of the use of these special minerals for various spiritual and magical purposes. The author Sepharial, whose original name is Walter Gorn Old (1864 - 1929) was a 19th-century astrologer, who used the nom-de-plume 'Sepharial', after an angel in the apocryphal Book of Enoch. An eminent English Theosophist, Sepharial was a well-known and respected astrologer in the late 19th and early 20th centuries and wrote numerous books, some of which are still highly regarded in some circles today. He was editor of 'Old Moore's Almanac', which is still published in the 21st century.