Sometimes during the growth of a crystal, a new layer grows over a transparent crystal. When the growth of the original crystal resumes, it’s left covered with a “shroud.” These inclusions of now indistinct, almost transparent crystals are called phantoms. This amethyst specimen contains pyramidal phantoms. La Sirena Mine, Mun. de Guanajuato, Guanajuato, Mexico. © Rob Lavinsky, www.iRocks.com. Used with permission.