Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    native element

Chemical Formula:   

Color:  tin-white; tarnishes to dark gray                    Streak:  same as color

Luster:  almost metallic


Hardness:  3.5             Specific Gravity:  5.7                 

Fracture:  uneven to fine granular

Cleavage:  present, but rarely seen


Crystal Forms and Habits:  Rhombohedral  (crystals rare)
     Usually granular massive

Mineral Associations:

Identifying Characteristics:

Uses:  arsenic ore


Toxicity:      when- very high              when inhaled- very high

Additional Information: