The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 65
l)een made in the following pages. The gabbro occurs apparently as an intrusive boss in the midst of 58 STRUCTURAL AND INDUSTRIAL MATERIALS OF CALIFORNIA. the granites. It outcrops over an area of about a square mile on thehill at Dehesa, and is said by Fairbanks to extend 4 or 5 miles south-east.… … ILL. No. 23. SECTION OF ORBICULAR GABBRO, SHOWING GENERAL APPEARANCE. White minerals are feldspars. Dark minerals are olivines, hornblendes and hyper- sthenes. Thickness, about 2mm. Natural size. rock. The boulders vary in size, some of the larger ones being severalfeet in diameter. The orbicular…
Building stones · Portland cement · Clay · Mines and mineral resources
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