Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2007-R.Weller


Mineral Information on:

Chemical Group:  phosphate

Chemical Formula: 

Color:  emerald green, grass green, apple green              Streak: same as color, but paler

Luster:  pearly to adamantine        Transparency:  transparent to translucent


Hardness:  2 to 2.5            Specific Gravity:   3.2              

Cleavage: 1 direction (perfect), micaceous         Tenacity:  brittle


Crystal Forms: Orthorhombic system, pseudo-tetragonal
     Crystals are usually square tables, sometimes thin, sometimes thick

Mineral Associations:  other uranium minerals

Identifying Characteristics:  green, mica-like square crystals, radioactive

Uses:   a source of uranium

Occurrences:    Czechoslovakia, Australia

Toxicity:      when-swallowed- dangerous               when inhaled- dangerous  Radioactive

Additional Information: