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Beryllium the chemical element with an atomic number of 4; a light metal with specialist industrial applications. 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 U.S. Department of Health and Human Services
- 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)
- Historic Price of Beryllium in USA
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