Spirit Quartz is amethyst cactus quartz. Amethyst crystals that form as cactus quartz.
Spirit Quartz is thought to be very good for higher self connection. Enhancing the amethyst meaning through the natural crystal formation. Mystics and followers of the chakra tradition understand that when the Crown chakra flowers; opens like the lotus flower, the petals of the flower connect the self to the higher self in all directions which enhances ability to all planes. The same is thought of spirit quartz.