PLATE XXI. 
1. Greenockite , sulphuret of cadmium, hexagonal prism, below with, simple and above with triple truncation of the 
basal edges, increased in size, from Bishoptowu, near Paisley. 
Fig. 2—6.—Bismuth Ores. 
2. Native, Bismuth , foliated crystalline, with rhombohedral structure, from Redruth in Cornwall. 
3. Metallic Bismuth , obtained artificially, in cube-like scalariform rhombohedrons, with an iridiscent tarnish. 
4. Native Bismuth , streaked, imbedded in compact grey cobalt, the so-called bismuth-cobalt, from Schneeberg. 
5. Bismuthine, containing copper, in right rhombic prisms, on horn-stone, from the Daniel mines at Schneeberg in 
Saxony. 
6. Eulytine , or Bismuth-blende, the most common form, a pyramidal tetrahedron, increased in size, from Schneeberg. 
Fig. 7—12.—Uranttjm Ores. 
7. Pitch-blende, the protoxide of uranium, botryoidal and compact, from Johann-Gecrgenstadt in Saxony. 
8. Uran-ochre , hydrous oxide of uranium, or carbonate of urania, from Johann-Georgenstadt. 
9. Lime-Uranite, or Yellow-Ur anite, in quadratic tables, with truncation of the basal edges, from Autun in France ; 
whence it is also called Autunite. 
10. Green Granite, chalcolite , emerald-green, in quadratic tables, partially truncated at the edges, on red hornstone, from 
J ohann-Georgenstadt. 
11. The same , a quadratic prism with truncation of the lateral edge, the square octahedron. 
12. The same, quadratic octahedron, with truncation of the vertex. 
Fig. 13—21.—Titanium Ores. 
13. Anatase , or octahedral oxide of titanium, an acute quadratic octahedron, the primary form. 
14. The same, the square octahedron partially combined with the prism, by truncation of the basal edges, on quartz from 
St. Gothard. 
15. The same , square octahedron, with truncation of the vertex, from Bourg d’Oisans in Dauphiuee. 
16. Rutile , or prismatic oxide of titanium , an octagonal prism, the quadratic prism truncated at the lateral edges, with 
truncation of the basal angles. 
17. The same , the crystalline forms aggregated as triplets, from St. Gothard. 
18. Brookite , rhombic oxide of titanium, a right rhombic prism with truncation of the obtuse lateral edges, and in com¬ 
bination with the rhombic octahedron, from Snowdon in North Wales. 
19. Sphene, Titanite , the titanate and silicate of lime, an oblique rhombic prism, the primary form, with truncation of 
the obtuse base angles, from St. Gothard. 
20. The same, with truncation of the acute angles, from Lisenz in the Tyrol. 
21. Ilmenite , rhombohedral titanate of iron, the primary form, a rhombohedron with truncation of the vertex and of the 
basal edges (hexagonal prism), from the Ilmengebirge, near Mask. 
Fig. 23.—Tantalum Ore. 
22. Tantahte (Niobite, Columbite), right rhombic prism with truncation of the lateral edges (rectangular prism), the most 
usual form of tantalite, from Bodenmais. 
Figs. 22 and 24. —Wolfram Ores. 
23. Wolfram , prismatic Scheelite , the primary form, a right rhombic prism with double truncation of the obtuse lateral 
edges, and of the basal angles and edges, the most usual form of scheelite, from Zinnwald. 
24. Tungsten, tungstate of lime , a quadratic octahedron, the primary form, on quartz from Zinnwald. 
