John Dee's crystal, used for clairvoyance & healing, 17th C

John Dee's crystal, supposedly given to him in November 1582 by the angel Uriel. Dee, who was Queen Elizabeth I's astrologer, used the crystal for clairvoyance. In 1640, it was given to the physician, Nicholas Culpeper (1616-1664) by Dee's son, Arthur, as a reward for curing his liver complaint. Culpeper used it to cure diseases but noted that its use rendered him weak and tempted (by a demon) to acts of lewdness with women and girls.