In chemistry a tungstate is a compound that contains an oxoanion of tungsten or is a mixed oxide containing tungsten. The simplest tungstate ion is WO42−, `orthotungstate`. Many other tungstates belong to a large group of polyatomic ions that are termed polyoxometalates, (`POMs`), and specifically termed isopolyoxometalates as they contain, ... Found on http://en.wikipedia.org/wiki/Tungstate