Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                          wellerr@cochise.edu
                                  copyright 2010-R.Weller

 

Mineral Information on:
astrophyllite

Chemical Group:   silicate

Chemical Formula: 
 
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7

Color:    bronze yellow to gold yellow                                                                    

Streak:
 

Luster: submetallic, pearly
 

Tenacity:  brittle

 

Hardness:   3              Specific Gravity:   3.3 to 3.6               Fracture:

Cleavage:  mica-like cleavage

 

Crystal Forms:  Orthorhombic System, elongated crystals
 

Habits:    starlike sprays

Mineral Associations:

Identifying Characteristics:

Uses:

Occurrences:  Norway; Greenland: Pikes Peak, Colorado

Toxicity:      when-swallowed-                            when inhaled-

Additional Information: