Dioptase: Copper Cyclosilicate Hydroxide         Cerussite: Lead Carbonate
  Tsumeb Mine, Tsumeb, Namibia  

  To get a mounted 8x10" full-color photo-quality print of this  
  picture, make a donation of $25 or more and include the  
  photo number ("Dioptase #8930") and your mailing  
  address, which will be used only to mail you this picture.