This a Royal Purple Aura double terminated quartz crystal.
Double terminated (DT) have points at both ends of the crystal. A DT radiates or absorbs energy at both ends simultaneously, channeling it in two directions at once. A stone of balance, a DT integrates spirit and matter and can provide a bridge between two energy points. Source: The Crystal Bible by Judy Hall
Royal Purple Aura embodies the purple ray; it is the color of intuition, imagination, psychic/metaphysical abilities. This crystal can assist you in increasing your spiritual gifts.