it is an opal: Mystical Properties: Opal is a stone of inspiration which enhances the imagination and creativity as well. It helps one release inhibitions and enhances the memory. Opal is also said to be a very spiritual stone, and can help one be "invisible" in situations where they don't care to be noticed. It has been known to bring happy dreams, and also to ease the process of change.
Opal is a silicate, containing water, correlating with our emotions. Clarifies by amplifying and mirroring feelings, buried emotions, desires (including love and passion). With this comes less inhibition, more spontaneity, free visualization, clearer imagination, and more vivid dreams. Blue: the ultimate stone for all forms of wishes, for entering the world of the fae (fairies) and for seeing beyond the immediate physical reality to the wonders within nature and life.