218 PHYSIOGRAPHY. 



Galena. 



2. Regular octahedron. Bleiberg in Carinthia. South- 

 ampton, (Mass.) 



3. Octahedron, with its angles truncated. Cumberland, 

 England. 



4. Octahedron, with its angles replaced by four planes 

 resting on the octahedral planes. 



5. The same, with the truncation of the summits of the 

 four-sided pyramids situated upon the angles of the octahe- 

 dron. 



6. The octahedron, with the edges truncated. 



7. The octahedron, with the edges bevelled, and the 

 angles truncated, the truncating planes being the primacy 

 faces of the species. 



8. The same, excepting that the edges are replaced by 

 three planes, (pentacontaedre, HAUY,) from Feistriz in 

 Stiria. 



9. The trigonal icositetrahedron. 



Fig. 208. 



Cleavage, parallel with the cube, highly perfect, and ea- 

 sily obtained. Fracture rarely discoverable. Surface, the 

 cube and the trigonal-icositetrahedron streaked parallel to 

 the edges of combination with the octahedron. Sometimes 

 subject to tarnish. 



Lustre metallic. Color pure lead-grey. Streak un- 

 changed. 



