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         Quartz.
        Source:  http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by  Chris 73
        
         
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          This image is a work of the "Minerals in Your World" project, a cooperative effort between the  United States Geological Survey and the  Mineral Information Institute. The images were featured in the "Minerals and Materials Photo Gallery" on the website of the  U.S House Subcommittee on Energy and Natural Resources. As a  work of the  U.S. federal government, the image is in the  public domain. | 
          
           
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