Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    oxide

Chemical Formula:   

Color:   red, nearly black                     Streak:  brownish red

Luster:  adamantine to submetallic; may also be earthy


Hardness:  3.5 t0 4        Specific Gravity:  6.10  

Fracture:  conchoidal     Tenacity:  brittle

Cleavage:  (111) weak


Crystal Forms:  Isometric system
     Crystals are usually octahedrons, but may also be cubes or dodecahedrons.
     An acicular form (needle-like) is called chalcotrichite.

Mineral Associations:  malachite, azurite, tenorite, copper, iron oxides

Identifying Characteristics:  softer than hematite, harder than cinnabar

Uses:  copper ore

Occurrences:  found in oxidized zones of copper deposits

Toxicity:      when-swallowed- moderate         when inhaled- moderate

Additional Information:  Cuprite can be replaced as a malachite pseudomorph.