Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2010-R.Weller


Mineral Information on:

Chemical Group:  arsenate

Chemical Formula: 

Color:    dark olive green                                Streak:


Hardness:    3            Specific Gravity:  3.9 to 4.4

Fracture:  conchoidal


Luster:   resinous to adamantine

transparent to almost opaque


Crystal Forms: Orthorhombic system, diamond-shaped acicular prisms

Habits: drusy, fiberous, nodulues, crusts

Mineral Associations:

Identifying Characteristics:


Occurrences:  Cornwall, England; Tintic, Nevada: Tsumeb, Nambia

Toxicity:      when-swallowed-   don't                         when inhaled- don't

Additional Information: