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    minerals, including a small number of closely allied species, position of the rock, until ultimately they become com- quartz 12 per cent., and micas 4 per cent. are the felspathic granites. Granite, as will be seen from FELSPAR is the name attached to an important class of The igneous rocks most suitable to the formation of clay granite, and they frequently present a more or less turbid bear the imprint of the latter. The oblique rhombic on those rocks which yield the raw materials of the pottery igneous rocks, pyroxenes and amphiboles 18 per cent., of the earth's crust, we must now concentrate our attention appearance, which increases in proportion to the decom- Tschermak supposes these species to form a continuous the foregoing table, consists of felspar, mica, and quartz, was probably the last to crystallise, as the crystals of the crystals of these minerals being easily detected through which may occur not merely in the same mass, but even, Having thus briefly outlined the general composition process of decomposition of granite, it would be well to study quartz, though much harder than those of felspar, often a lens. During the cooling of the fused granite, the quartz CERAMIC CHEMISTRY. felspar crystals, however, are not always well developed in pletely kaolinised and opaque. Before describing the through simultaneous crystallisation, in the same crystal. industry. the composition and properties of its essential minerals.

     

     

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