Amethyst is a crystal of protection, selflessness, nobleness, spiritual consciousness, meditativeness, balance and inner peace.
The Sahasrara chakra is symbolized by a lotus with a thousand different colored petals, arranged in twenty layers of 50 petals. It encompasses the crown of the head, where all chakras are integrated, while it passes into infinity from the top of the head. It is said to be the most elusive chakra in the kundalini process. This chakra is associated with wisdom, enlightenment and transcendence. Its governing planet is Uranus, and it is often linked to the pituitary gland.
When our crown chakra is blocked or closed, however, we feel disconnected spiritually. We tend to doubt everything we've known to be true. In worst case scenarios we tend to fall into an existential black hole, or Dark Night of the Soul.