PLATE XIX. 
Pigs. 1—10.—Brown Ironstone and other Ores of Iron. 
1. Stalactitic hematite , of radiated fracture, from Brazil, 
2. Kidney-shaped Iron Ore , scaly, and partially covered by red-ochre, from Saxony. 
8. Pea-Iron Ore , enclosed in calcareous clay, from Salmendingia. 
4. Finely granular lenticular clay Ironstone , with small petrifactions ( avicula elegans) 1 from the brown Jura of Wasseral- 
singen, from Wiirtemberg. 
5. Spathic Iron Ore , carbonate of iron crystallised in rhombohedrons, the primary form, from Neudorf in the Harz. 
6. Bog-Iron Ore (basic phosphate of iron), kidney-shaped, from Lake Onega in Russia. 
7. Vivianite , or phosphate of the protoxide of iron, in oblique rectangular prisms, with truncation of the longitudinal 
and lateral edges, from Auvergne. 
8. Scorodite , arseniate of iron, with four equivalents of water, from Schwarzenburg. 
9. Cube Iron Ore , arseniate of iron, with eighteen equivalents of water, from Schwarzenberg in Saxony. 
10. Copperas , proto-sulphate of iron, in oblique rhombic prisms, obtained from the natural salt of (Irani, neat 
Schwarzenberg, by crystallisation. 
Figs. 11—19. —Hausmannite, or Manganese Ore. 
11. Hausmannite , red oxide of manganese, primary form, the quadratic octahedron, at the points in combination with a 
second lower octahedron, from Ihlefeld in the Harz. 
12. Braunite , oxide of manganese, primary form, a quadratic octahedron truncated at the angles, from Ilmenau in 
Thuringia. 
13. The same, a more acute quadratic octahedron in combination with the obtuse octahedron, and truncated at the points, 
from the same locality. 
14. Manganite , hydrous oxide of manganese, a rhombic prism, with truncation of the acute lateral edges, from Ihlefeld in 
the Harz. 
15. The same , the lateral edges of the rhombic prism doubly truncated or bevelled, and the basal edges and angles like¬ 
wise truncated, from Ihlefeld. 
16. Pyrolusite , binoxide of manganese, primary form, a rhombic prism, with truncation of the lateral edges, and of tin- 
obtuse and acute angles, an oblong octahedron, from Ilmenau. 
17. The same, radiately foliated, in compact masses, from the same locality. 
18. Psilomelane binoxide of manganese, containing baryta or potash, in globular, clustery masses, from Siegen in Nassau. 
19. Rhodonite , or Manganese Spar, silicate of manganese, from Kapnik in Hungary. 
