Cochise College          Photos of Minerals

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                          Roger Weller, geology instructor

                          wellerr@cochise.edu
                                  copyright 2006-R.Weller
 

Mineral Information on:
heulandite


Chemical Group:  silicate  (zeolite)

Chemical Formula: 
CaAl2Si7O18.6H2O

Color:   white, gray, red, brown           Streak:  white
 

Luster:  vitreous, pearly on cleavage surfaces

 

Hardness:  3.5 to 4     Specific Gravity:  2.18 to 2.22                 

Fracture:  sub-conchoidal to uneven      Tenacity:  brittle

Cleavage:  one direction, perfect

 

Crystal Forms:  Monoclinic
      Crystals almost appear orthorhombic

Mineral Associations:  occurs with other zeolites

Identifying Characteristics:

Uses:

Occurrences:  Iceland, India, New Jersey