PLATE XXII. 
Figs. 1 and 2.—Molybdenum Ores. 
1. Molybdenite, sulphuret of molybdenum, with some molybdcnic ochre imbedded in quartz, from the Valais. 
2. Molybdenite, primary form, a six-sided prism. 
Fugs. 8 ASP 4. — Chrome Ores. 
3 . 
4 . 
Chromic Ochre (oxide of chromium), with chromic ironstone, from Baltimore in the United States. 
Chromic Ironstone , primary form a regular octahedron. 
Fig. 5 — 10.—Antimony Ores. 
5. Native Antimony , rhombohedron the primary form, with truncation of the basal edges, from Allemont in France. 
6. Grey Antimony, antimony glance, or stibine, a rhombic octahedron, the primary form, with truncation of the basal 
edges, of the obtuse lateral edges, and double truncation of the obtuse basal angles. 
7. The same , rhombic prism, with truncation of the obtuse lateral edges, in combination with the rhombic octahedron, 
the crystals are curved, foliated, and striated longitudinally, from Wolfsberg in the Harz. 
8. The same, in radiating bundles, from Frzibram in Bohemia. 
9. Red Antimony, kermesite, oblique rhombic needles, with a radiating arrangement, on quartz, from Braunsdorf in 
Saxony. 
10. Oxide of Antimony, valentinite, octahedral white antimony in regular octahedra, of adamantine lustre, arranged in a 
cluster, from Qued-Hamimim in the province of Constantine. 
Fig. 11—20.—Arsenic Ores. 
11. Native Arsenic, scaly, massive, curved, and foliated, from Andreasherg in the Harz. 
12. Orpiment, or yellow sulphuret of arsenic, the sesqui-sulphuret of arsenic, crystalline and foliated, from Turkey. 
13. The same, a right rhombic prism, the primary form, with truncation of the obtuse angles and of the acute lateral 
edges, from Kapnilc. 
14. The same, similar crystals on chalky marl, from Neusohl in Hungary. 
15. Realgar, simple sulphuret of arsenic, an oblique rhombic prism, the primary form, with truncation of the obtuse basal 
edges and of the lateral edges, from Kapnik. 
16. The same, several such crystals on chalk maid from the same place. 
17. Mispicke.l, in right rhombic prisms, the primary form ; some crystals on the outside show the truncation of the 
obtuse, others that of the acute angles, partly in combination with truncation of the obtuse lateral edges ; from Freiberg in 
Saxony. 
18. Arsenic-bloom, arsenious acid , ivhite arsenic, in regular octahedrons and tetrahedrons, the product of subterraneous 
fire, from Auvergne. 
19. Fharmacolite, arseniate of lime, an oblique rectangular prism the primary form, with truncation of the obtuse lateral 
edges and of the basal edges. 
20. The same, in radiated needles aggregated in bundles, partly reddened by arseniate of cobalt, from the old cobalt 
mines near Wittichen, in the Black Forest of Wurtembevg, 
