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 to green             Streak:  white

Transparency:  subtransparent to subtranslucent


Hardness:  6.5         Specific Gravity:  3.35 to 3.45                 

Luster:  vitreous to resinous      Fracture: sub-conchoidal to uneven

Cleavage:  not very distinct


Crystal Forms:  Tetragonal system
     Crystals are prismatic or pyramidal.
     May also occur in massive form.

Mineral Associations:  grossularite, phlogopite, diopside, wollastonite, epidote

Identifying Characteristics:  4 sided prismatic crystals and associated with garnet



Toxicity:      when-swallowed-                            when inhaled-

Additional Information:  Also known as idocrase (when massive, resembles jade)