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Beryllium is a toxic bivalent element, steel grey, strong, lightweight, primarily used as hardening agent in alloys. Beryllium has one of the highest melting points of the light metals. It has excellent thermal conductivity, is nonmagnetic, it resists attack by concentrated nitric acid and at standard temperature and pressures beryllium resist oxidation when exposed to air. 
Beryllium is a naturally occurring element that is present in rocks, coal, oil, soil, and volcanic dust. Some beryllium compounds are soluble in water. Two kinds of minerals, bertrandite and beryl, are commercially mined for the recovery of beryllium. The majority of beryllium that is mined is converted into alloys.