... Report on the building and ornamental stones of Canada, vol. I-V (1912)
Parks, W. A. (William Arthur), 1868-1936, Canada. Mines Branch · Ottawa : Government printing bureau · leaf 202
the feldspar and the darkmineral is chiefly biotite with a little hornblende and minute grains ofmagnetite. Corrosion produces no appreciable change in colour.The physical properties are:— Specific gravity 2 . 789 Weight per cubic foot, lbs 171.363 Pore space per cent 0. 432 Ratio of absorption,… … Roberval granite. Berniers quarry, Roberval, Que. Plate XIX.
Building stones
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