Opal comes in a variety of colors. 
Its good for creativity, inspiration, imagination, and memory. Opal promotes good and bad characteristics and allows bad one to come out so you can deal with them.
Its also known to alleviate depression and fatigue. It can calm an anxious mind.
This is a great stone to assist with psychic abilities.
Hexagonal shaped crystals are used for protection and cleansing. It symbolizes strength, protection, and helps balance opposing forces. 
It can Also be used as a pendulum. Which assists with finding answers in a ritual called pendulum dowsing.