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Beryllium ( ) is the chemical element with the symbol Be and atomic number 4. Because any beryllium synthesized in stars is short-lived, it is a relatively rare element in both the universe and in the crust of the Earth. It is a divalent element which occurs naturally only 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.
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ATSDR Case Studies in Environmental Medicine: Beryllium Toxicity
www.atsdr.cdc.gov/csem/beryllium/ - Web
It's Elemental – Beryllium
education.jlab.org/itselemental/ele004.html - Web
National Institute for Occupational Safety and Health – Beryllium Page
www.cdc.gov/niosh/topics/beryllium/ - Web
Gallery for «Beryllium»
Former Worker Medical Screening Program
www.hss.energy.gov/healthsafety/fwsp/formerworkermed/ - Web
National Supplemental Screening Program (Oak Ridge Associated Universities)
www.orau.org/nssp/ - Web
Historic Price of Beryllium in USA
minerals.usgs.gov/minerals/pubs/commodity/beryllium/100798.pdf - Web