A System of Mineralogy: Descriptive Mineralogy, Comprising the Most Recent Discoveries

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J.Wiley & sons, 1889 - Mineralogy - 48 pages

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Page vii - To change is always seeming fickleness. But not to change with the advance of science, is worse ; it is persistence in error...
Page 63 - Roepper attributes to the pyrite of the Pennsylvania coal used. Pyr., etc. — In the closed tube a sublimate of sulphur and a magnetic residue. BB on charcoal gives off sulphur, burning with a blue flame, leaving a residue which reacts like pyrrhotite. Insoluble in muriatic acid, but decomposed by nitric acid. Obs. — Pyrite occurs abundantly in rocks of all ages, from the oldest crystalline to the most recent alluvial deposits. It usually occurs in small cubes, but often modified as above described...
Page 195 - A velvet-black siliceous stone or flinty jasper, used on account of its hardness and black color for trying the purity of the precious metals. The color left on the stone after rubbing the metal across it indicates to the experienced eye the amount of alloy.
Page xli - Tableau comparatif des résultats de la cristallographie et de l'analyse chimique relativement à la classification des minéraux...
Page iv - And being now but half-way between the fifties and sixties, it is my hope that the future will afford another opportunity for similar work.
Page xlv - Report on the geology of the Lake Superior land district : by JW Foster and JD Whitney, United States Geologists. Part II.

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