Galena

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

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

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

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

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

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

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

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

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

10. 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 DoD/ANL

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. by-sa: alexik close up of CRT screen USCPSC USCPSC by-nc-nd: CraigOppy What about flatscreens? Flatscreen monitors do not contain lead, but they do contain mercury. EPA

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

13. 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. by: Soctech by-nc-sa: cindy47452 These bans will prevent many people, especially children, from becoming poisoned by lead. LBNL by-sa: Unhindered by Talent by-nc-nd: pmecologic by-nc-nd: R80o

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

15. Our notation description public domain (none) Creative Commons Licenses by by-sa by-nc-sa by-nd by-nc-nd GNUGNU Free Documentation License © Copyright. All rights reserved media rights Many of the photos in this presentation were obtained through Flickr and Wikipedia. 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.