260 



PHYSIOGRAPHY. 



Vitreous Silver. 



ria, in Mansfield, in Hessia, &c. A foliated variety is found in Corn- 

 wall, in the Bannat, in Siegen, and in Mansfeld. 



Compact virieties are found at Schuyler's mines, New Jersey, in 

 the old red sandstone, and in the same rock in Connecticut, at Simsbury 

 and Cheshire. 



VITREOUS SILVER. Dodecahedral Polypoi- 

 one-Glance. 



Primary form. Cube. 

 Secondary forms. 



Cube, with angles truncated. 



Freiberg. 



3. 

 Cube, with edges truncated. 



5. Fig. 465. 



Regular octahedron. 

 Joachimsthal. 



4. 

 Rhombic dodecahedron. 



6. Fig. 466. 



Freiberg. 



Freiberg. 



Cleavage, sometimes traces parallel to the rhombic do- 

 decahedron. Fracture imperfect and small conchoidal, 

 uneven. Surface, nearly of the same description in all the 

 forms, often uneven, and possessing low degrees of lustre. 

 Subject to tarnish. 



Lustre metallic. Color blackish lead-grey. Streak 

 shining. 



