. Annual report . Mr. M. T. Culbert, who found it to contain a pyroxene withparallel extinction and low interference colors, and who considered it to be similar mineral occurs in some of the diabases described above. Mr. N. L. Bowen*has also found enstatite in a thin section from the diabase at Gowganda, and saysthat the slide presents no difference whatever from the diabase of the Cobalt area.* The diabase on the west part of La Rose property does not differ materially incomposition or texture from the typical outcrops in other parts of Cobalt, except thatit is finer in grain. Rod
. Annual report . Mr. M. T. Culbert, who found it to contain a pyroxene withparallel extinction and low interference colors, and who considered it to be similar mineral occurs in some of the diabases described above. Mr. N. L. Bowen*has also found enstatite in a thin section from the diabase at Gowganda, and saysthat the slide presents no difference whatever from the diabase of the Cobalt area.* The diabase on the west part of La Rose property does not differ materially incomposition or texture from the typical outcrops in other parts of Cobalt, except thatit is finer in grain. Rods of labradorite set in allotriomorphic grains of augite essen-tially constitute the rock, and the usual decomposition products have resulted in and a small amount of quartz and feldspar in micrographic intergrowth arealso present. This diabase outcrop on the west side of the railway, opposite La Rosemine, is on the downthrow side of a fault. *Jour. Geo., , 1910. 102 Bureau of Mines No. 4. Fig. 46.—Jointing planes in diabase on west face of Mount Diabase, Cobalt. 1913 Cobalt-Nickel Arsenides and Silver 103 Three sections were examined which are a little outside the Cobalt silver areaproper. They are all quartz-diabases. One of them, taken beside the Temiskaming andNorthern Ontario Railway between Bass and Mud lakes, shows the rock to containlabradorite, hornblende, small amounts of augite, abundant quartz in micro-graphic intergrowth with feldspar, and ilmenite. The labradorite is nearly all decom-posed to saussurite and the hornblende present seems to have resulted from the texture is ophitic. Another specimen, also beside the railway, was collectedabout half a mile farther west, between Mud lake and the Montreal river. It is similarto the last specimen, with the exception that it contains accessory biotite. A specimen from the Imperial Cobalt, near Portage bay, south part of lot 15 inthe sixth concession of Coleman is seen to be much deco
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
