Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    chromate

Chemical Formula:   

Color:  bright hyacinth red               Streak:  orange-yellow


Hardness:  2.5           Specific Gravity:  6.26 to 6.44                

Fracture:  conchoidal          Luster:  adamantine to vitreous

Transparency:  translucent

Cleavage:  (110) distinct, (001) and (100) less distinct


Crystal Forms:  Monoclinic system
     Crystals are usually prismatic.

Mineral Associations:

Identifying Characteristics:

Uses:  rare, mostly as mineral specimens

Occurrences:  Deposited from hot solutions containing chromic acid that encounters lead deposits.

Toxicity:      when-swallowed- very high        when inhaled- very high

Additional Information: