Report on the building and ornamental stones of Canada (1912)
Parks, William A. (William Arthur), 1868-1936, Canada. Mines Branch (1901-1936) · Ottawa : Dept. of Mines, Mines Branch · leaf 187
mm. in diameter. In addition there are more sharply defined,smaller black grains. These dark minerals are enclosed in a lighter crystal-line groundniass which does not exceed one-half of the whole surface(Plate XXVn. lender the microscope the large greenish sjiots are seen to hv horn-blende which… … Purpluriuc niunzuiiilu, Kus^laiul, B.t. 119 transmitted light. The larger crystals of the light-coloured minerals areorthoclase enclosing small columnar crystals of plagiodasc. The presenceof the two feldspars in the absence of quartz makes the rock a monzonite,and the relati\eh large size of the…
Building stones · Geology, Economic · Stone industry and trade
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