Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 197
lorescence isperceptible upon exposed blocks. Continual vigilance must,however, be exercised in selecting stone, as much of it containsshaly pockets and pyritiferous seams- The bluestone from thissame region, which has been largely used in the Governmentworks of improving the Kanawha River, is a… … SANDSTONES AND CONGLOMERATES (UNITED STATES). 167 is pyritiferous, and great care must be used in selection. Thisstone has been used in one or two important buildings, andwith very bad results, it beginning to discolor and exfoliatewithin two or three years. At Grafton, in Taylor County, a light…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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