It is an insoluble solid compound, BeO, hexagonal, r.d.
3.01, m.p 2530°C.
It occurs naturally as bromellite,
and can be made by burning beryllium in oxygen or
by the decomposition of beryllium carbonate or hydroxide.
It is an important amphoteric oxide, reacting with
acids to form salts and with alkalis to form compounds
known as beryllates.
It is used in the production of
beryllium and beryllium-copper refractories, transistors
and integrated circuits.