Lovely Rainbow Fluorite Tower.
 
Fluorite is a crystal that offers focus, clarity and protection.  It helps to balance emotions and keep your emotions stabilized.  It is a stone known to help you if you struggle to focus at school or work and can also help ease your mind while meditating.  I like to have fluorite around my yoga mat for when I meditate.  The mantra I repeat during my meditations with fluorite is that "I am clear with my intention I have set for myself.  I am focused and strong." 
 
Photo credit to Divine Gem