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:  pale yellow, colorless, dark yellow, yellow-brown

Fracture:   uneven to sub-conchoidal


Hardness:    7 to 7.25              Specific Gravity:   2.97 to 3.02     

Cleavage:  basal, indistinct            Luster:  vitreous to greasy

Tenacity:  brittle            Streak:   white

Transparency:  transparent to translucent     


Crystal Forms:   Orthorhombic
     Crystals are prismatic and resemble topaz crystals.

Mineral Associations:  microcline, oligoclase, dolomite

Identifying Characteristics:

Uses:  rarely as a gemstone

Occurrences:  New York; Switzerland, Madagascar 

Toxicity:      when-swallowed-        when inhaled-

Additional Information: