Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                          wellerr@cochise.edu
                                  copyright 2010-R.Weller
 

 

Mineral Information on:
romanechite

Chemical Group:   oxide

Chemical Formula:  
(Ba,H2O)2Mn5O10

Color:      grayish black, black                                                                   

Streak:    brownish black
 

opaque

Luster:  sub-metallic

 

Hardness:  5 to 6               Specific Gravity:    6.45           

Cleavage:  none

 

Crystal Forms:
 

Habits:  acicular, botryoidal, fibrous, reniform

Mineral Associations:

Identifying Characteristics:

Uses: manganese ore

Occurrences: France; Germany; England; Brazil; Arizona, Virginia, Michigan 

Toxicity:      when-swallowed-                            when inhaled-

Additional Information:  primary constituent of psilomelane