Crystals can take millions of years to grow, deep underground. They have an orderly and symmetrical atomic structure, with unique looking external planes and faces. They may have a varied colours,could be opaque or clear, but all are very beautiful and attractive to people, both young and old. They make beautiful jewellery, and have a number of scientific uses, but they are also powerful healing tools which amplify, focus, and transmit energy. Practitioners can be trained in the complex use of these stones, but they are easily used by anyone who cares to study the many excellent books on offer.