Westmorland Slates Their Geology Chemistry And Architectural Value a Paper R
Westmorland Slates Their Geology Chemistry And Architectural Value a Paper R
Thomas, J. J. (John Jacob)
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Loss on ignition . .. . Silica Alumina . .. .. . Protoxide of Iron . .. . Sesquioxide of Iron . .. . Not determined (alkaliesj . Analysis of the material of the green bands in tlie bluish-purple slates at Llanberis ; made by the E(>-|. "> Titanic Acid 0'63 Alumina l:\~W Protoxide of Iron . .. .. 1'71 Peroxide of Iron 1'41 Protosesquioxide of Manganese . . - 91 Lime 2-8(5 Magnesia 6'28 Potash 0-05 Soda . 0-90 Carbonic Acid I'oO Combined Water 8'90 Hygroscopic Water 'U; 99-91 4. Analysis of the p...urple slates of Nantlle. Kirwan's Mineralogy. Cambrian formation. Silica 48 Argillaceous Matter 2(! Magnesia 8 Lime 4 Iron . . 14 12 5. Analysis of a green Westmorland slate ; by George Vogt. Silica 50'88 Alumina 14'12 Iron Oxide (Ferrous) . .. . 9'96 Lime 8'72 Magnesia 8'67 Carbon Dioxide 6'47 Potash -88 99-70 It will be seen from the foregoing analyses that slates are chiefly made up of silica and alumina, from which we may reasonably infer that they were once ordinary clay.
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