Beryllium is a Heavy Metal with a symbol of Be and an atomic number or 4. It is rare as it has a relatively short life.  Beryllium is found in such gem stones as aquamarine, emerald and chrysoberyl.

According to the EPA website, beryllium causes internal lesions.  It is most often found as a discharge from metal refineries, and coal-burning factories; also discharge from aerospace and defense industries.