The Mineral and Gemstone Kingdom Hershel Friedman http://www.minerals.net/mineral/elements/telluriu/telluriu.htm Tellurium Another use is as a gasoline additive to reduce engine knock. Sverre Hauge http://www.kj.uib.no/personer/shauge/shauge.html catena-poly[Di--chlorobis{tetrachlorotellurate(IV)})--bromine][C6H5(CH3)3N]2 n[Te2Cl10Br2]n I think CH3 is Methyl. Bromine is used in fuel. Here bromine is bound to a tellurate. [log in to unmask]