In the course of studies in the system CaO-SiO2-H2O (1), several new calcium silicate hydrates were prepared. One of these, C2SHx,† termed “Phase Y” by Roy, was found to be in equilibrium with α′-C2S and water above 800° C. at about 1000 atm. water vapor pressure. Determination of weight loss on heating to 1250° C. gave the formula C6S3H.

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