...In general, the soil is light-colored soft sand, nearly pure silica... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...It is curious to observe the different forms which silica assumes...
David Livingstone 「Missionary Travels and Researches in South Africa」
...In the hardening process the silica was sometimessweated out of this rock, and it exists now as pretty efflorescences ofwell-shaped crystals...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...The principal impurity, however, is generally silica, leftundissolved on treating the litharge with nitric or acetic acid...
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」
...We already know stars and suns forwhich spectral analysis reveals a predominance of silica, e...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...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」
...25 Rock composed principally of silica and alumen forming sandstone...
Charles Sturt 「Expedition into Central Australia」
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