Abstract: A process for the production of an aluminosilicate containing at least 9 weight percent alumina, having a BET surface area of 300-600 m.sup.2 /g, and an average pore volume of of 0.2-0.5 ml/g is disclosed. The process includes the steps of preparing an aqueous solution comprising at least one metal silicate, adjusting the pH of said aqueous solution comprising at least one metal silicate with a sufficient amount of an aqueous solution comprising at least one aluminum salt to produce an aqueous solution having a pH of 4.4-7.7, precipitating aluminosilicate from the aqueous solution by concurrently dosing additional aqueous solution comprising at least one metal silicate in such a manner such that the pH is maintained at 4.4-7.7, steps (a)-(c) being carried out at a temperature of 0.degree.-80.degree. C. and isolating said aluminosilicate. The aluminosilicate is useful as a pressure sensitive pigment in carbonless copy paper.