| 释义 |
cement rock cement rock[si′ment ‚räk] (petrology) An argillaceous limestone containing lime, silica, and alumina in variable proportions and usually some magnesia; used in the manufacture of natural hydraulic cement. cement rock, cement stoneA clayey limestone whose percentage composition of alumina, lime, and silica is about that of cement; may be used without the addition of other earth materials. |