Cochise College          Photos of Minerals

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                          Roger Weller, geology instructor

                          [email protected]
                                  copyright 2006-R.Weller
 

Mineral Information on:
chromite

Chemical Group:  oxide

Chemical Formula:  (Mg,Fe)Cr₂O₄

Color:  black           Streak:  brown         Luster:  metallic

Hardness:  5.5         Specific Gravity:   5.09      Fracture:  uneven

Cleavage: none

Crystal Forms:  Isometric system
      crystals rare; commonly massive, granular

Mineral Associations:

Identifying Characteristics:

Uses:  chromium ore

Occurrences: found in ultrabasic igneous rocks