Cochise College          Photos of Minerals

                          Geology Home Page                

                          Roger Weller, geology instructor

                                  copyright 2006-R.Weller

Mineral Information on:

Chemical Group:    carbonate   

Chemical Formula:   

Color:  white, gray, grayish black, or tinted blue or green

Streak:  uncolored                   Fracture:  conchoidal


Hardness: 3 to 3.5                 Specific Gravity:  6.46 to 6.574              

Cleavage:  (110) and (021)     Luster:  adamantine, pearly, resinous, vitreous

Tenacity:  very brittle


Crystal Forms:  Orthorhombic system
     Crystals can be tabular, prismatic, or pyramidal.
     Elongated crystals are referred to as jackstraw cerussite.
     Twinning either as contact or penetration twins is common; 6-sided stellate twinning can
     be characteristic of cerussite.

Mineral Associations: Found in oxidized lead ore zones.

Identifying Characteristics: high density for a white mineral

Uses:  lead ore

Occurrences:  Pennsylvania, Missouri, Colorado, Arizona, New Mexico 

Toxicity:      when-swallowed- very high       when inhaled- very high

Additional Information: