Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2010-R.Weller


Mineral Information on:

Chemical Group:     sulfide

Chemical Formula:  

Color:   black to steel gray; darker than tetrahedrite                                                                      

Streak:  black to reddish black


Hardness:   3 to 4              Specific Gravity:     4.6            

Fracture:  subconchoidal

Luster:  metallic



Crystal Forms:  Isometric System: forms tetrahedrons

Mineral Associations:

Identifying Characteristics:

Uses:  may contain silver


Toxicity:      when-swallowed-                            when inhaled-

Additional Information: