Howlite is a great stone to have in your "crystal toolbox" when meditating. Promoting serenity of mind, it will help you focus and remove distracting thoughts. Howlite is a calming stone. It will give you the gift of wisdom & enlightenment. 
Lava stones are used for grounding. Lava is porous and the beads can be infused with essential oils. A few drops of lavender essential oil on the beads will leave the wearer calmer, easing any emotional distress
 
8mm Howlite & Blue Lava Stones