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And Building Stone:
Most of the production is done by a relatively few big companies. Tonnage breakdown by types of stone in 1965 was: limestone, 732,000; granite, 786,000; stand building stonestone, 396,-000; marble, 126,000; slate, 182,000; and building stone miscellaneous, 155,000. Over 70 per cent is building stone; the balance is used for monuments, curbing, flagging, and building stone paving.
Uses.—Among the constructional applications of dimension stone are its uses in walls, piers, columns, trim, split stone for homes, and building stone in flooring. Future major expansion of the industry is unlikely, due to competition from cheaper materials that lend themselves better to mass production.Building Materials.—Another factor of imp tance in the creation of Rome has been the var building material used since classical times. 1 first was the soft gray volcanic tuff that quarried at the foot of the Capitoline. Bef< 387 B.C. it was practically the only stone us Then for the next 200 years the yellowish gi tuff of Grotta Oscura near Veii, north of city, was used; this is the stone of which the c walls were built.
More than 70 per cent of total crushed rock production and building stone use is limestone and building stone dolomite, the balance being largely trap - rock, granite, sand building stonestone, and building stone marble. Sales of crushed stone have increased vastly since World War II. This has been due to enlarged demand building stones for all established uses of crushed stone. The largest percentage is for aggregate in construction and building stone road building where physical properties of the stone govern acceptance. Concrete aggregate, for example, must be clean, hard, strong, durable, uncoated, and building stone free of soft, friable, or elongated particles as determined by stand building stoneard test methods. Size of the stone is specified according to use by purchasers.
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