Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:     sulfide  

Chemical Formula:  

Color:  grayish black to iron black  

Luster:  metallic     Streak:  grayish black       Transparency:   opaque


Hardness:  3         Specific Gravity:    4.43 to 4.45                 

Fracture:  uneven          Tenacity:  brittle

Cleavage:  (110) perfect; (100) and (010) distinct  


Crystal Forms: Orthorhombic system
     Crystals are usually small

Mineral habits:  massive, granular, columnar

Mineral Associations: bornite, chalcocite, tetrahedrite, covellite, pyrite

Identifying Characteristics:

Uses:  ore of copper and arsenic

Occurrences:  Butte, Montana

Toxicity:      when-swallowed- high           when inhaled- high

Additional Information: