| |
| | USGS Minerals Information: Lead |
 | | Lead is a very corrosion-resistant, dense, ductile, and malleable blue-gray metal that has been used for at least 5,000 years. |
 | | Prior to the early 1900's, uses of lead in the United States were primarily for ammunition, brass, burial vault liners, ceramic glazes, leaded glass and crystal, paints or other protective coatings, pewter, and water lines and pipes. |
 | | Contributing to the increase in demand for lead was the use of lead as radiation shielding in medical analysis and video display equipment and as an additive in gasoline. |
| minerals.usgs.gov /minerals/pubs/commodity/lead (514 words) |
|