The present invention relates to a powder mixture for resorbable calcium phosphate biocements, which mixture consists of 40 99% by volume of powder having a particle size of 0.1 10 .mu.m, 1 20% by volume of powder having a particle size of 10 43 .mu.m and 0 59% by volume of powder having a particle size of 43 315 .mu.m, which powder is obtained by grinding the spontaneously crystallizing melts of a material comprising crystalline and X-ray amorphous phases, which material a) according to .sup.31P-NMR measurements, contains Q.sub.0-groups of orthophosphate and Q.sub.1-groups of diphosphate, the orthophosphates or Q.sub.0-groups making up 65 to 99.9% by weight relative to the total phosphorus content of the powder mixture and the diphosphates or Q.sub.1-groups making up 0.1 to 35% by weight relative to the total phosphorus content of the powder mixture, and b) according to X-ray diffractometric measurements and relative to the total weight of the powder mixture, contains 35 to 99.9% by weight of a main crystal phase consisting of various Ca-orthophosphates and 0.1 to 20% by weight of a secondary crystal phase consisting of various Ca-diphosphates and chain phosphates, and c) besides the main crystal phase, contains an X-ray amorphous phase which in total makes up 0.1 to 65% by weight relative to the total weight of the powder mixture.