Fluorite: “Stone of the Mind”, Aids comprehension and decision making, discourages chaos.
Obsidian: Shields from negativity, sharpens inner & outer vision. Gazing stone, the pursuit of the truth.
Amazonite:  Soothes emotions, and nerves and dispels both irritating and negative        energy.  Refresh the Heart and Throat Chakras.  
Andean Opal:  Assists in spiritual journeying, instills knowledge of right action and 
   dispels reaction, activate heart chakra, providing for centering and grounding.