Cunningham’s Encyclopedia Crystal, Gem and Metal Magic by Scott Cunningham. Published 31st March 2008.

Practice an ancient magic that is both natural and powerful―the elemental Earth magic of crystals, stones, and metals. This comprehensive and clear guidebook by Scott Cunningham has introduced over 200,000 readers to the secrets of over 100 gems and metals. Learn how to find and cleanse stones and use them in divinations, spells, and tarot card readings. Discover how to determine the energies and stories contained within each stone, and the symbolic meanings of a stone’s color and shape. Also included in this classic guide: ―A 16-page full-color insert, new with this edition ―Birthstone and jewelry magic lore ―Tables listing both planetary and elementary rulers of stones, magical intentions, and magical substitutions