Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                          [email protected]
                                  copyright 2006-R.Weller

Mineral Information on:
pumpellyite

Chemical Group:  silicate  (zeolite)

Chemical Formula:  6CaO.3Al₂O₃.7SiO₂.4H₂O

Color:  bluish green      

Hardness:  5.5                 Specific Gravity:   3.2              

Cleavage: present

Crystal Forms: Orthorhombic system
     Crystals rare

Mineral habits: small chatoyant nodules

Mineral Associations:  found in amygdaloidal basalt

Identifying Characteristics:  green color, silky luster, turtle back pattern

Uses:  sometimes as gemstones

Occurrences:  Isle Royale in Lake Superior

Toxicity:      when-swallowed-                            when inhaled-

Additional Information:  Also known as Isle Royale greenstones or chlorastrolite