In this A-Z guide to 555 gem-stones, each one illustrated by a vibrant colour photograph, you will learn their individual mineralogical and essential healing properties. The latter are related to Spirit, Soul, Mind and Body. The former indicate especially how the crystal was formed, (for example, molten magma or extreme pressure give rise to distinctively different healing effects of a crystal). Availability or Rarity are indicated. A wealth of information contained within an extremely handy pocket guide.