What I love about Michael Gienger’s book, Healing Crystals The A-Z guide to 430 gemstones, is first the size.  It fits in my purse because it is only 1/4 inch thick and measures 4 1/2 inches by 6 1/2 inches. This is so convenient when traveling or visiting gemstone stores.  The author lists the important healing effects and areas of activity of each crystal as follows:  (SP) refers to the ‘spirit or spiritual aspect’, including intentions, aims and focus on life;  (S) refers to the ‘soul or the subconscious’, including temperament, emotions, intuitive perceptions, dreams, psychological experiences, habits and unconscious reactions; (M) refers to’mindor mental aspects’, including ideas, values, convictions, views, manner of thinking, and conscious action; and (B)  refers to the ‘body or physical aspect’, the human organism as a whole with its senses, organs and functions.

This is one of my  favorite reference books.