Lithium Quartz occurs as a prismatic quartz crystal and contains inclusions of the mineral Lithium, and it is this inclusion that is responsible for the  pink/mauve colour. 
It is a rare stone and found only in the remote location of Minas Gerais, Brazil. 
It is said to have a sweet calming energy an effective aid to help stress and tension, and is an excellent meditation stone. 
It helps one release negative attachments as it reinforces the flow of positive energy.

Smaller Lithium Quartz cluster