Petrographical aspects of the polishing of natural roadstones

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Abstract
The relation between the petrology and polished‐stone coefficient of various natural roadstones, which have been polished in an accelerated‐wear machine at the Road Research Laboratory, is discussed. The mineralogy, the variation in hardness of the constituents, the texture and the amount of alteration all appear to be connected with the degree of polish which the rock acquires during the test. These factors variously affect the different roadstone groups.

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