Geology Home Page
Roger Weller, geology instructor
Chemical Group: carbonate
Chemical Formula: PbCO3
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
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