Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                          wellerr@cochise.edu
                                  copyright 2006-R.Weller
 

Mineral Information on:
howlite


Chemical Group:   borate

Chemical Formula:   
H5Ca2SiB5O14

Color:    white                Streak:  white
 

Hardness:    3.5                 Specific Gravity:   2.58               
 

Crystal Forms:  Monoclinic?

Habits:  rounded nodules with black streaking
 
Mineral Associations:  other borates

Identifying Characteristics:

Uses:   as a gemstone (white) or dyed blue to resemble turquoise

Occurrences:  Lang, California

Toxicity:      when-swallowed-                            when inhaled-

Additional Information: