A Manual of Lithology Treating of the Principles of the Science With Special R
A Manual of Lithology Treating of the Principles of the Science With Special R
Edward Higginson Williams
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This type is found in Bohemia, the Mittelgebirge, the Lausitz, Cornwall (Wolf Rock), central France, Teneriffe, and the Canaries. The groundmass, of trachytic habit, is cleavable with difficulty or not at all ; luster sub-greasy ; color generally light-gray or yellowish gray ; of rough porous feel. In rare cases small phenocrysts of nepheline appear with plagioclase. This is found in the Rhone district and Bohemia, and must MANUAL OF LIT HO LOG Y. be distinguished from the old so-called " trach...ytic phono- lite, " which had lost its cleavage from weathering. The groundmass is partly soluble in HC1, the soluble part being nepheline and zeolites, while the feldspathic part is insoluble. The specific gravity, and the percentages of soluble matter and of water, are inversely proportionate to the percentage of silica. The cleavable states generally split readily and in thin sheets, so that the rock can be used for slating (Cantal in central France). Whole mountains of phonolite are divided by joints one foot apart.
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