The book Mineralogical Magazine, volume 7 was written by author Mineralogical Society (Great Britain) Here you can read free online of Mineralogical Magazine, volume 7 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Mineralogical Magazine, volume 7 a good or bad book?
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* Jbid. 1881, i. 227. Digitized by Google THE OCCUBBENCE OF RUTILE -NBEDLES IN OLAYS. 203 present in ali clays, and they certainly vary in abnndance in those specimens which contain them. In some they are extraordìnarily abnndant, in others they are comparatively rare. The needles mnst not be confused with the larger crystals and graìns of rutile which are often so abnndant in the finer sands and clays. The latter are probably as dis- tinct in origin as they are in character from the former. I ...will now give a brief account of the mineralogical character of those clays in which I have observed the needles. The ill-defined substance (or substances) generally termed kaolin forms of coarse in each case the bulk of the day. This will not be referred to. The measnrements appended will give a general notion of the sizes of the constitaents. Pipe-clay from the Bagshot Beds, Alum Bay, Me of Wight, — Quartz grains ; diameter of average grains about '013 mm. Prisms of tounnaline sometimes terminated at one end by the faces of a rhombohedron and at the other by the basai piane, thas showing the characteristic hemimorph- ism ; -012 X '02 and «012 X -046.
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