The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 194
ne layers contain manyfossil fragments. The clay beds have been elevated and crumpledsomewhat. At the clay pit where they are working the strata standvertically. The clay crumbles and slakes rapidly on exposure to theair, so it is customary to plow it up and leave it exposed to the airand sun a… … (187) 188 STRUCTURAL AND INDUSTRIAL MATERIALS OF CALIFORNIA. Analysis of Clay Used by the Pacific Portland Cement Company. Per Cent. Silica (SiO,) 58.65 Alumina (AUOj) 18.25 Loss on ignition (mainly water with a little organic matter) 10.00 Iron oxide (FegOs) 7.35 Lime (CaO) 2.15 Magnesia (MgO)…
Building stones · Portland cement · Clay · Mines and mineral resources
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