8mm in size, approximately 15" length. Selenite provides for clarity of the mind, expanding ones awareness of the self and of ones surroundings. It opens the crown and higher crown chakras and accesses angelic consciousness and higher guidance. It can be used to access past lives as well as future lives. Selenite is a calming stone that instills deep peace and is excellent for meditation or spiritual work. It assists judgement and insight. It clears confusion and aids in seeing the deeper picture.