Andean Blue Opal Hydrated Silica. Si02-H20. Hardness 6. Source: Chile The Andean Blue Opal has soft relaxing energies. It takes the tension out of communication and helps ideas flow freely. Andean Blue Opal softens the impact of stress from the outside world and can help one to release the trauma of old wounds. It facilitates facing the future with tranquil healing nature. This stone is good for quieting the mind and as an aid to sleep.