PLATE III. 
Figs. 1—19. —Quartz. 
1. Yellowish-red Ferruginous Quartz , crystallised as a double hexagonal twin pyramid, from Compostella in Spain. 
2. Rock-crystal , a rhombohedron, with the hexagonal prism, resulting from truncation of the basal angles, from Amsteg, 
at the Gotthardtstrasse. 
3. Rose Quartz , double pyramid and hexagonal prism, all the faces regularly shaped, from the East Indies. 
4. Smoky Quartz , in hexagonal pyramids, from the copper gangs of the variegated sandstone at Neubulack in the Black 
Forest of Wirtemberg (Schivarzwald ). 
5. Amethyst , in six-sided pyramids, in a mass of agate, from Chemnitz in Hungary. 
6. Group of Rock crystal , in hexagonal prisms and pyramids, transparent, from a crystal cavern at Gotthardt. 
7. Group of Rock crystal , with a predominance of solitary crystals, part of them truncated] at basal angles, transparent, 
with a yellowish shade, from Dauphine. 
8. Amethyst , cut as a stone for a brooch, from Brazil. 
9. Nodule of Egyptian Jasper , striped with brown. 
10. Nodule of Jasper polished, red and yellow, from Auggen in Upper Baden. 
11. Ribbon Jasper , striated with red and green, from Siberia. 
12. Heliotrope , or blood-stone , dark green and dotted with red, polished as a stone for a ring, from the East. 
13. Heliotrope , polished, from the Southern Tyrol. 
14. Light red Carnelian , from Egypt, cut for a ring. 
15. Moss Agate , or Mocca-stone , white chalcedony, with dendrites, or moss-like figures, from the East. 
16. Yellow and white polished Chalcedony. 
17. Light yellow Chalcedony , polished. 
18. Milky Quartz , with brilliant play of colours, cut as a stone for a ring. 
19. Needle Amethyst , a pale amethyst, with small enclosed crystals of tourmaline, from New Holland. 
