I often use howlite for calming the mind and I often suggest it to my clients who have repeat negative thought patterns.
It slows the activity of the mind and allows undisturbed rest. It is used in the teachings of patience and aids memory expansion. Howlite can eliminate rage and calm violent, uncontrolled anger. Keep it in your pocket or on your person to absorb negative energies. The pink aspect is of course soothing on the heart chakra, perfect crystal for anyones pocket.