. Transactions. Fig. 1. Fig. 2. Fig. 1.—Carbonaceous sandstone from Sheffield; canister, used forthe manufacture of silica brick. dissemination of mica between thequartz grains. natural light) magnification, x 136. Fig. 2.—Same sample as Fig. 1, under polarized light. is very variable; that of Fontainebleau analyses per cent, silica;after this come the j^ellow argillaceous sands, and finally sandy

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries