13. Strontian in Aphrite. 14. Calcareous Heavy-spar, or Curved Lamellar Heavy-spar. 15. Calaite or Mine- ral Turquois discovered in Lower Silesia. 16. Cry- soprase and Chromate of Iron. 17. Datolite discover- ed at Andreasberg. 18. Haytorite. 19. On the Elec-