Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    silicate

Chemical Formula:   

Color:  brown            Streak:  gray       Luster:  vitreous to sub-resinous


Hardness:  7            Specific Gravity:  3.7 to 3.8             Fracture:

Cleavage:  distinct cleavage in one direction


Crystal Forms and Habits:  Monoclinic system
     Staurolit commonly forms interpenetration twins, either at a 60 degree angle
     or at a 90 degree angle.

Mineral Associations:  a metamorphic mineral, often found in mica schist

Identifying Characteristics:  Staurolite does form single crystals, but twinned crystals
     make the reputation for this mineral.

Uses:  The right angle twins are used in jewelry and are marketed as "fairy crosses".

Occurrences:  Georgia, Virginia 

Toxicity:      when-swallowed- low        when inhaled- high

Additional Information: