1. Galena Cubic crystal structure by-nc-nd: OldOnliner GNU

2. Galena typically forms in low-temperature and medium-temperature hydrothermal ore veins that occur in: by-nc-sa: Ron Schott by-nc-nd: skylarprimm by-nc-sa: Ron Schott igneous rocks, and sedimentary rocks. pegmatites,

3. Lubec, Maine, lead mine (from Jackson, 1837) Maine Geological Survey/State of Maine As a replacement mineral, galena can be found in sedimentary rocks, either throughout the rock or filling holes in carbonate rocks. by-nc-nd: OldOnliner by-nc-nd: corsakti

4. Galena is the main ore for lead, which has been used by humans for the past 8500 years Lead is easy to shape. www.theodoregray.com by-sa: Andrew Dunn Lead water pipes (Roman) Lead coin (Roman)

5. by-nc-sa: Kenners by-nd: kchbrown by-nc-sa: Oldtasty Lead is still used in decorative pottery, roofing, ammunition, crystal glass, radiation shielding, cables, batteries, and television and computer monitors. www.theodoregrey.com by: Nika by-nc: fahrenheit45one USCPSCv USCPSC

6. by-nc-sa: mrccos This 18 th century musket fires 1 ounce of lead. This 19 th century lead bullet is from the war between the states. by-sa: Unhindered by Talent Lead 9mm bullets (with copper casing) www.theodoregrey.com

7. by-nc: ddamredheadby-nc-sa: hermox by-nc-sa: Monceau by-nc-nd: j.towbin Lead is in lead crystal and leaded glass

8. by-nc: craig1black Lead-acid batteries are the back up for servers in case of a power outage, and in solar energy systems. Lead-acid batteries, a type of wet-cell battery, are used in starting engines and powering accessories/machines. by-nc: fahrenheit45one by-nc: NuckleheadEd by-nc-nd: Tom T by-nc: Neil T

9. by-nc: Tom Chambers by: Nika by-nc-sa: cmiked by-nd: PetroleumJelliffe Lead is used as a radiation shield in medicine. Lead aprons are often used at dentists' offices to protect patients from radiation. Staff usually step behind full-body shields. City & County of Honolulu

10. DoD/ANL In this photo, decontamination technicians remove the lead and graphite blocks from a nuclear reactor vessel. Lead from the mineral galena is used in nuclear power plants. by: lisaschaos

11. Computer monitors and televisions all have a Cathode Ray Tube (CRT) which contains up to 2 pounds of lead. All CRT televisions and computer monitors must be properly recycled. USCPSC close up of CRT screen EPA USCPSC by-sa: alexik What about flatscreens? Flatscreen monitors do not contain lead, but they do contain mercury. by-nc-nd: CraigOppy

12. Lead in household items can enter the human body and cause lead poisoning. US EPA/R&D Washington State Department of Health Lawrence Berkley National Laboratory www.theodoregrey.com Lead in ammunition can poison meat, or can be consumed by other animals in the ecosystem. EPA

13. by-nc-sa: cindy47452 by: Soctech by-nc-nd: R80o by-sa: Unhindered by Talent Lead is harmful to the human body. It was banned in paint in 1978, in solder (for cans and water pipes) in 1986, and completely banned in gasoline by 1996. These bans will prevent many people, especially children, from becoming poisoned by lead. LBNL by-nc-nd: pmecologic

14. Galena Cubic crystal structure by-nc-nd: OldOnliner GNU

15. media rights Many of the photos in this presentation were obtained through Flickr and Wikipedia.FlickrWikipedia Funded by FIPSE and by the University of Minnesota. Compiled for Dr. Kent Kirkby, Department of Geology and Geophysics, by Kate Rosok, 2007. Each displayed image retains its original media rights. For educational purposes only; not to be used commercially.FIPSEUniversity of MinnesotaDr. Kent Kirkby Department of Geology and Geophysics public domain (none) © Copyright. All rights reserved by-nc-sa by by-nd by-sa by-nc-nd Creative Commons Licenses GNUGNU GNU Free Documentation LicenseGNU Free Documentation License Our notation description