Annual report . part of the map-sheet along the Keewatin-Timiskamian contact. These rocks are so altered that it is difficult to classifythem distinctly. In the fresher samples of fine-grained greenstone a basaltic texture can beobserved showing rods of plagioclase set in a groundmass of pyroxene or horn-blende, which is generally altered to chlorite. The chemical composition of typicalKeewatin rocks from the northern part of the township is shown below: 1. 2. Per cent. Per cent. Silica Alumina Ferrous oxide Ferric oxide 4. 28 Lime Magnesia 3.
Annual report . part of the map-sheet along the Keewatin-Timiskamian contact. These rocks are so altered that it is difficult to classifythem distinctly. In the fresher samples of fine-grained greenstone a basaltic texture can beobserved showing rods of plagioclase set in a groundmass of pyroxene or horn-blende, which is generally altered to chlorite. The chemical composition of typicalKeewatin rocks from the northern part of the township is shown below: 1. 2. Per cent. Per cent. Silica Alumina Ferrous oxide Ferric oxide 4. 28 Lime Magnesia Soda Potash Carbon dioxide Water Manganous oxide .... 0,32 1.—Ellipsoidal greenstone (l)asalt) 15 chains west of ITT mile post, nortli line of Teck township. 2.—Amygdaloidal greenstone (basalt), Aniikouganii lake, 15 chains north of III mile post, north line of Teck township. This rock also shows an ellipsoidal structure. Department of Mines No. 4 ^^§^2. Jr^^^. ElliiJSoidal greenstone, Aiuikougunii lake, wiiich lies to the northwest of the map sheet.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
