Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:   sulfate

Chemical Formula:  

Color:  colorless, white, grayish, dark gray, bluish        Streak:  white


Hardness:  3 to 3.5        Specific Gravity:  2.89 to 2.98            Fracture:

Luster:  vitreous to pearly       Transparency:  transparent to translucent

Cleavage:  resembles cubic cleavage


Crystal Forms:  Orthorhombic system
      usually massive, fine granular

Mineral Associations:  found with gypsum, limestone, dolomite, and salt

Identifying Characteristics:

Uses:  Plaster of Paris

Occurrences:  Texas, Germany, Mexico, Canada

Toxicity:      when-swallowed- low          when inhaled- moderate

Additional Information: