Lepidolite

Lepidolite is a phyllosilicate mineral, often pink, purple, and red in color, but also lilac-grey, and, rarely, yellow and colorless. It is a lithium-bearing mica, and the most abundant lithium-bearing mineral there is.
Its chemical formula is K(Li,Al)3(Al,Si,Rb)4 O10 (F,OH)2, but its characteristic pink, purple, and red hues are caused by trace amounts of manganese. Because of its lithium content (which is used in anti-anxiety medication and is known to rebalance emotions), lepidolite is said to have a calming and stabilizing effect on the wearer or holder.