The Crown chakra or in Sanskrit is called the Sahasrara meaning 'thousand petals'.
Located at the top of the head, its function is to connect you with the Universe, God, higher self, or subconcious self.
Its corresponding gland is the pituitary gland and secondly to the pineal and hypothalamus. It regulates the endocrine system, and due to its location it regulates the whole nervous system.
The Crown chakra main characteristics include Conciousness, connection, presence, feelings of peace, realization and empathy.
Some Gemstones that can affect the Crown Chakra are tourmaline, selenite and clear quartz.
Imbalances in the Crown Chakra include feeling like you are disconnected from spirit, living in your head, closed mindedness, being disconnected to the earthly realm, and obsessive attachment to spiritual matters.