Abstract: A hydrated calcium silicate slurry composition is made up of 100 parts by weight of hydrated calcium silicate, 5 to 40 parts by weight of a powdered resin and water and molded articles are produced therefrom. In addition to the above components, 1 to 30 parts by weight of a reinforcing fiber and/or 20 to 35 parts by weight (as solids) of a latex or emulsion may be used. When the latex or emulsion is used, the powdered resin is reduced to an amount of 5 to 20 parts by weight. Since the molded calcium silicate articles have a superior workability and a good thermal dimensional stability, they are very useful especially in the preparation of molds or models where high levels of processing precision and thermal stability are required.