Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    sulfide

Chemical Formula: 
Fe5S6 to Fe16S17     

Color:  between bronze gray and copper-red            

Streak:  dark grayish black          Luster:  metallic 

Transparency:  opaque 


Hardness:  3.5 to 4.5             Specific Gravity:  4.58 to 4.64                

Fracture:   uneven to subconchoidal     Tenacity:  brittle

Crystal Forms and Habits: Hexagonal system
     Usually massive and granular

Mineral Associations:  pentlandite, chalcopyrite, pyrite, magnetite

Identifying Characteristics:  variable magnetic


Occurrences:  Sudbury, Ontario, Canada; also Brazil and Tennesee 

Toxicity:      when-swallowed-          when inhaled-

Additional Information:  Pyrrhotite is sometimes referred to as magnetic pyrite.