Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                          wellerr@cochise.edu
                                  copyright 2006-R.Weller
 

Mineral Information on:
millerite

Chemical Group:    sulfide

Chemical Formula:   
NiS

Color:  brass yellow to bronze yellow; tarnishes gray-iridescent          

Streak:  greenish black        Luster:  metallic 

Transparency:  opaque 

 

Hardness:  3 to 3.5             Specific Gravity:  5.3 to 5.65               

Fracture:   uneven       Tenacity:  brittle
 

Crystal Forms and Habits: Hexagonal system
     Usually very slender hair-like crystals.

Mineral Associations: 

Identifying Characteristics:  hair-like crystals in geodes 

Uses:     

Occurrences:  Iowa, Missouri, Wisconsin, Pennsylvania

Toxicity:      when-swallowed-          when inhaled-

Additional Information: