From the CRC handbook of Chemistry and Physics, CRC Press, Cleveland, 55th ed., 1974-75 "The Elements" by C.R. Hammond. page B-7
Beryllium (Gr. berryllos, beryl; also called Glucinium or Glucinum, Gr. glykys, sweet;), Be; at. wt. 9.01218; at. no. 4; m.p. 1278+/-5 C; b.p. 2970 C; sp. gr. 1.848 (20 C); valence 2. Discovered as the oxide by Vauquelin in beryl and in emeralds in 1798. The metal was isolated in 1828 by Wohler and by Bussy independently by the action of potassium on beryllium choloride. Beryllium is found in some 30 mineral species, the most important of which are: beryl, chrysoberyl, and phenacite. Aquamarine and emerald are precious forms of beryl. Beryl (3BeO Al2O3 6SiO2) is the most important commercial source of the element and its compounds. Most of the metal is now prepared by reducing beryllium flouride with magnesium metal. Beryllium metal did not become readily available to industry until 1957. The metal, steel gray in color, has many desireable properties. It is one of the lightest of all metals, and has one of the highest melting points of the light metals. Its modulus of elasticity is about one-third greater than that of steel. It resists attack by concentrated nitric acid, has excellent thermal conductivity, and is nonmagnetic. It has the high permeability to x-rays, and when bombarded by alpha particles, as from radium or polonium, neutrons are produced in the ratio of about 30 neutrons/million alpha particles. At ordinary temperatures beyllium resists oxidation in air, although its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Beryllium is used as an alloying agent in producing beryllium copper, which is extensively used for springs, electrical contacts, spot-welding electrodes, and nonsparking tools. It is finding application as a structural material for high-speed aircraft, missiles, and spacecraft. It is used in nuclear reactors as a reflector or moderator for it has a low termal neutron absorption cross section. It is used in gyroscopes, computer parts, and inertial guidance instruments where lightness, stiffness, and dimensional stability are required. The oxide has a very high melting point and is also used in nuclear work and ceramic applications. Beryllium and its salts are toxic and should be handled with the greatest care. Beryllium and its compunds should not be tasted to verify the sweetish nature of beryllium (as did early experimenters). The metal, its alloys, and its salts can be handled safely if certain work codes are observed, but no attempt should be made to work with beryllium before becoming familiar with proper safeguards. The maximum allowable concentration of beryllium dust in an 8-hr. day is recommended to be about 2 u gms./cu. meter in working areas. The average monthly concentration should not exceed 0.01 u gms/cu. meter in non-working areas. Beryllium metal in vacuum cast billet form is priced roughly at $70/lb. Fabricated forms are more expensive.
