PHYSIOGRAPHY. 



Fahlerz. 



193 



3. It occurs disseminated through Calcareous Spar, in the mine of 

 Skrickerum in Smoland. 



FAHLERZ. Tetrahedral Copper-Glance. 



MOHS. 



Primary form. Tetrahedron. 

 Secondary forms. 



Fig. 177. Fig. 178. 



2. 



Fig. 180. 



4. 



Kapnik. 



Schwatz, (Tyrol.) 



5, Rhombic dodecahedron. 



6, Icosatetrahedron. 



7, Trigonal dodecahedron, resulting from the extension 

 of the bevelling planes in Fig. 179. 



Cleavage, not visible, except traces of the octahedron. 

 Fracture conchoidal, of different degrees of perfection 

 Surface, the tetrahedron and the trigonal dodecahedron 

 17 



