Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                          wellerr@cochise.edu
                                  copyright 2006-R.Weller
 

Mineral Information on:
dumortierite

Chemical Group:    silicate

Chemical Formula:  8Al₂O₃.B₂O₃.6SiO₂.H₂O

Color:    bright blue to greenish blue, lavender blue, violet rose       

Hardness:  7         Specific Gravity:   3.26 to 3.36                

Luster:  vitreous        Transparency:  transparent to translucent

Cleavage:  (100) distinct

Crystal Forms:  Orthorhombic system

Mineral habits:  fibrous to columnar masses

Mineral Associations: 

Identifying Characteristics:

Uses:

Occurrences:   New York, Arizona, Nevada, California

Toxicity:      when-swallowed-          when inhaled-

Additional Information: