1. AN INTEGRATED POROUS HYDROUS CALCIUM SILICATE PRODUCT, CONSISTING ESSENTIALLY OF TWO CRYSTALLINE STRUCTURES, ONE OF SAID CRYSTALLINE STRUCTURES HAVING THE COMPOSITION 4CAO.5SIO2.5H2O, AND THE OTHER CRYSTALLINE STRUCTURE HAVING THE COMPOSITION 5CAO.5SIO2.H2O BEING PRESENT AND COMBINED WITH SAID FIRST MEMTIONED STRUCTURE, THE SAID CRYSTALLINE STRUCTURES BEING CONTINUOUSLY INTEGRATED WITH EACH OTHER IN RANDOM DISPERSION, AND FORMING A THREE-DIMENSIONAL NETWORK INTERSPERSED WITH VOIDS, THE AGGREGATE VOLUME OF THE VOIDS BEING IN EXCESS OF THAT OF THE CRYSTALS.

6. THE METHOD OF FORMING AN INTEGRATED HYDROUS CALCIUM SILICATE PRODUCT WHICH COMPRISES PROVIDING AN AQUEOUS SLURRY CONSISTING ESSENTIALLY OF SOLIDS IN THE FORM OF REACTIVE LIME, REACTIVE SILICA AND A SUSPENSION AGENT FORSAID SOLIDS IN THE FORM OF HIGHLY SPICULATED FIBERS, WHEREIN THE INITIAL MOLAR RATIO OF LIME TO SILICA IS AT LEAST 0.8 BUT LESS THAN 1.0, THE AMOUNT OF WATER IN THE MIXTURE BEING WITHIN THE RANGE OF ABOUT 7.0 TO .75 TIMES THE AGGREGATE WEIGHT OF THE SOLIDS, SUBJECTING SAID SLURRY TO A TEMPERATURE AND PRESSURE IN EXCESS OF 175* C. AND 130 P. S. I. ABS, RESPECTIVELY, MAINTAINING SAID SLURRY AT A TEMPERATURE AND FOR A PERIOD OF TIME NECESSARY TO EFFECT SUBSTANTIALLY QUANTITATIVE REACTION BETWEEN THE REACTIVE LIME AND SILICA COMPONENTS, THEREBY TO PRODUCE A CRYSTALLINE END PRODUCT CONTAINING A CRYSTALLINE COMPOUND IN INTEGRATED FORM, THE PERCENTAGE OF SUCH COMPOUND PRESENT IN SAID END PRODUCT BEING DEPENDENT UPON THE INITIAL MOLAR RATIO OF LIME TO SILICA IN THE SLURRY, THE ONE SAID CRYSTALLINE COMPOUND HAVING THE COMPOSITION 4CAO.5SIO2.5H2O AND DRYING SAID PRODUCT.

8. A REACTION PRODUCT, COMPRISING DISPERSED FINELY DIVIDED FIBERS AND DISPERSED THIN PLATY CRYSTALS, HAVING A COMPOSITION OF

10. METHOD OF MAKING A NEW HYDROUS CALCIUM SILICATE, COMPRISING THE STEPS OF DISPERSING FINELY DIVIDED REACTIVE LIME AND FINELY DIVIDED REACTIVE SILICA IN THE FORM OF QUARTZ, IN THE MOLECUALR PROPORTIONS OF APPROXIMATELY 4 TO 5, IN WATER, THE WATER TO SOLIDS RATIO BEING NOT MORE THAN 26:1 BY VOLUME UNDER SATURATED CONDITIONS RELATIVE TO THE LIME COMPONENT IN SOLUTION, WHEREIN THE DISPERSION IS MAINTAINED BY FINELY DIVIDED FIBERS, AND SUBJECTING THE SAID DISPERSION TO TEMPERATURES WITHIN THE RANGE FROM 150* C., TO APPROXIMATELY 200* C., WHILE MAINTAINING THE DISPERSION SUBSTANTIALLY QUIESCENT DURING THE REACTION FOR A PERIOD OF TIME VARYING WITH RESPECT TO TEMPERATURE, TO EFFECT SUBSTANTIALLY QUANTITATIVE REACTION BETWEEN THE SAID REACTIVE LIME AND REACTIVE SILICA COMPONENTS BOTH TO FORM A HYDROUS CALCIUM SILICATE HAVING THE FORMULA 4CAO.5SIO2.5H2O AND TO INTEGRATE THE SAME.