The Mosaical And Mineral Geologies Illustrated And Compared
The Mosaical And Mineral Geologies Illustrated And Compared
W Mullinger William Mullinger Higgins
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Mica slate, sometimes called Micaceous Schistus, usually superposes gneiss, and consists of quartz and PRACTICAL GEOLOGY. 47 mica, but contains garnets in so great abundance, that they may be almost said to be an essential ingredient. The prevailing colour of this rock is grey; it is in- variably stratified, and the strata are sometimes greatly contorted. It usually forms extensive tracts of moun- tainous country, but the acclivities of its elevation are not so bold and steep as those which are... formed of gneiss : it is beautifully exposed at Bolt Head and the neighbouring headlands, on the coast of Devonshire. Gneiss is that rock which usually superposes granite, from which it can be distinguished only by the general parallelism of its mica or hornblende, its composition being generally the same. The word gneiss is said to have originated with the German miners; but it was Werner who limited the term to the rock of which we are speaking. It often- times forms mountains of considerable elevation, as at Mont Rosa, in Italy, and the middle range of the Pyrenees.
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