glaucolite--prophetes.ai

glaucolite Min.
  (ˈglɔːkəlaɪt)
  [f. Gr. γλαυκός (see glaucous) + -lite.]
  A massive variety of wernerite of a bluish or greenish colour.

1827 in Philos. Mag. Ser. ii. II. 463 Glaucolite. A new Mineral Species. 1868 Dana Min. (ed. 5) 320.

Oxford English Dictionary