Mineral resources . Association of ehalcopyrite, zinc-blende, and galena in impure silica, Mount Boppy Lode. The shaded portions represent the sulphide. Tiny veinlets of quartz may be seen traversing the impure silica, x 2. Plate **M Ore from Mount Boppy Lode. Shaded portions represent iron pyrites breaking down intolimonite. Light-coloured portions consist of impure quartz. 49Primary Minerals. Minerals of this class consist of iron pyrites, chalcopyrite (in part), galena<in part), zinc-blende (in part), gold (in part), glassy quartz and galena and zinc-blende appear to be ma
Mineral resources . Association of ehalcopyrite, zinc-blende, and galena in impure silica, Mount Boppy Lode. The shaded portions represent the sulphide. Tiny veinlets of quartz may be seen traversing the impure silica, x 2. Plate **M Ore from Mount Boppy Lode. Shaded portions represent iron pyrites breaking down intolimonite. Light-coloured portions consist of impure quartz. 49Primary Minerals. Minerals of this class consist of iron pyrites, chalcopyrite (in part), galena<in part), zinc-blende (in part), gold (in part), glassy quartz and galena and zinc-blende appear to be mainly secondary, however, whilethe chalcopyrite appears to belong to both periods of deposition. Iron pyrites occurs massive and as cubes in quartz and slate. In almostevery instance of its occurrence, as at the Boppy Gold, the Bonnie Dundee,and the Budgerygar, Mines, the pyrites occur as cubes, either scattered orset closely together. Gossans from country thickly studded with such cubi-cal pyrites have a texture frequently cavernous, to one almost spongy innature, by reason of the removal of the cubes of pyrites by leaching. Thismethod of occurrence for the pyrites clearly indicates its origin by replace-ment either of country
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
