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:  white, grayish, pale green, yellow, red, honey-yellow,
olive green                                                                        

Streak:   white        Transparency:  transparent to translucent


Hardness:  5 to 5.5               Specific Gravity:  2.9 to 3.0                

Luster: vitreous, sub-resinous

Cleavage:  not observed


Crystal Forms:  Monoclinic system
     Crystals are usually short and prismatic.
     Habit: botryoidal, columnar, massive

Mineral Associations:  found in cavities in basalt; associated with calcite and zeolites

Identifying Characteristics:

Uses:  rarely as a gemstone

Occurrences:  crystals from New Jersey; pink massive nodules Lake Superior region

Toxicity:      when-swallowed- low         when inhaled- high

Additional Information: