...The per cent of silica in the ash of several common fodderplants is given below:... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...If soils were composed of nothing but pure silica sand, nothing wouldever grow; but in Nature we find that soils contain all sorts of mineralmatter, and chief amongst these is lime...
Various 「Argentina From A British Point Of View」
...The principal impurity, however, is generally silica, leftundissolved on treating the litharge with nitric or acetic acid...
George Field 「Field's Chromatography」
...Invented about the year 1540, in Saxony, is a vitreous compound ofcobalt and silica, in fact a blue glass...
George Field 「Field's Chromatography」
...Native ultramarine consists of silica, alumina, sulphur, and soda; itscolouring matter seeming to be due to hyposulphite of soda and sulphideof sodium...
George Field 「Field's Chromatography」
...In most specimens iron ispresent, varying in quantity from a mere trace up to five per cent,together with silica and alumina...
George Field 「Field's Chromatography」
...25 Rock composed principally of silica and alumen forming sandstone...
Charles Sturt 「Expedition into Central Australia」
...A mixtureof lime and clay, a tufaceous deposit, and an apparently recent depositof soapstone, containing a variety of substances, as alumina, silica,lime, soda, magnesia, and iron...
Charles Sturt 「Expedition into Central Australia」
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