Of Astrione. chap. 16.
AStrion is a precious stone of Inde, nigh like to Christall. In the middle thereof shineth a star with cléerenesse of the full Moone: and hath that name of A∣stris, starres: for if it be set in the starres light, it taketh light of them, as Isidore saith, cap. de Christal.