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Beryllium ( ) is the chemical element with the symbol Be and atomic number 4. It is a divalent element which only occurs naturally in combination with other elements in minerals. Notable gemstones which contain beryllium include beryl (aquamarine, emerald) and chrysoberyl. As a free element it is a steel-gray, strong, lightweight and brittle alkaline earth metal.

See also 

 :Category:Beryllium compounds
 Sucker Bait, a story by Isaac Asimov in which the health hazard of beryllium dust is an important plot point

References

Further reading 
 
 Mroz MM, Balkissoon R, Newman LS. "Beryllium." In: Bingham E, Cohrssen B, Powell C (eds.) Patty's Toxicology, Fifth Edition. New York: John Wiley & Sons 2001, 177–220.
 Walsh, KA, ''Beryllium Chemistry and Processing''. Vidal, EE. et al. Eds. 2009, Materials Park, OH:ASM International.

External links 

 ATSDR Case Studies in Environmental Medicine: Beryllium Toxicity U.S. Department of Health and Human Services
 WebElements.com – Beryllium
 It's Elemental – Beryllium
 MSDS: ESPI Metals
 National Institute for Occupational Safety and Health – Beryllium Page
 Former Worker Medical Screening Program, U.S. Department of Energy
 National Supplemental Screening Program (Oak Ridge Associated Universities)

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