Abstract: A zirconium silicate brick and a method for producing same, the brick having a starting powder used to form the brick, the starting powder having minimal amounts of contaminants in the amount of not more than about 0.3 percent Al.sub.2 O.sub.3, not more than about 0.2 percent TiO.sub.2, and not more than about 0.1 percent Fe.sub.2 O.sub.3, each, based on the weight of the starting powder, to which a phosphorous compound in the amount of about 0.1 percent to about 5 percent based on the weight of the starting powder is added prior to making the brick for producing a brick with improved corrosion resistance for use in glass melting facilities with boron silicate glasses, and having improved decomposition behavior at higher glass melting temperatures.