K(Li,Al,Rb)2(Al,Si)4O10(F,OH)2 

Lithium rich mica is known as lepidolite and occurs in yellow, pink and silvery lavender colors. It contains the highest levels of lithium of any mineral in the kingdom. 

Some people drink chamomile tea to relax, while others make lepidolite rock tea. I'm not sure if its a good idea to drink lithium tea but I've done it before and its pretty fucking relaxing.