Howlite helps with stress and anger.  This ia a calming crystal, quieting an overactive mind, dispelling negative mind chatter and pessimistic thoughts.
Tuck Howlite under your pillow to help with insomnia 
 
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.