It is beyond the scope of this article to give a full discourse on quartz crystals. You can find many books written about crystal healing and you will see that the discussion of quartz crystals in these books usually takes a lion's share of the space, and rightfully so. The use of color to create or alter certain emotions or moods has long been an accepted practice by many traditional professional mental health doctors and care givers. We also borrow from ancient Eastern culture to further associate these colors with the various chakra centers in the body. A chakra is an energy center, and there are seven major centers starting with the root chakra, located at the base of the spine, and ending at the crown of the head.
Primary color is dark indigo blue, or various shades of dark blue.
Now, having said all that, you must remember that each kind of crystal and mineral can and does have other transformational properties that are specific to that crystal or mineral . When you want to acquire more in depth knowledge about these properties, buy or check out one or more of the many books that cover this subject. But in the meantime, you now have enough information to make a reasonably good selection by using the associated color method. It has been shown through Kirilian photography that the aura or energy fields surrounding an object extends a considerable distance from its core. It becomes a matter of personal taste and pocket-book, after the right kind of crystal is chosen.