Background
Auguste Michel-Lévy was born on August 7, 1844 in Paris, France.
(Excerpt from Étude sur la Détermination des Feldspaths da...)
Excerpt from Étude sur la Détermination des Feldspaths dans les Plaques Minces au Point de Vue de la Classification des Roches M. Rosenbusch commettait une double erreur en prêtant un minimum à la zone de symétrie, qui passe, comme toutes les zones, par et en refusant au maximum une valeur caractéristique. Nous verrons que cette zone est restée la seule pratique pour l'étude des microlites feldspathiques et que, fort heureusement, elle peut donner à elle seule la solution complète du problème. Si nous insistons sur ces origines, c'est qu'elles expliquent jusqu'à un certain point l'état actuel de la question et ses répercussions sur les questions les plus générales de la pétrographie, telles que l'emploi ou le rejet des éléments du second temps de consolida tion dans la classification des roches porphyriques. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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(This is a reproduction of a book published before 1923. T...)
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geologist mineralogist petrologist
Auguste Michel-Lévy was born on August 7, 1844 in Paris, France.
Michel-Lévy was a brilliant student. His interest turned to geology, and in 1862 he matriculated at the Polytechnic School, then entered the School of Mines, from which he graduated at the head of his class in 1867.
From 1870 Levy made his career with the government Geological Map Service, serving as its director from 1887 until his death. He was named to the Academy of Sciences in 1896.
Michel-Lévy proposed the use of birefringence to study minerals in thin section and measured this property for many minerals. He also developed statistical techniques to describe the chemical composition of feldspars; his methods have been applied to other minerals. He formulated the first classification of igneous rocks that considered mineralogy, chemical composition, and texture. With Ferdinand Fouqué, Michel-Lévy studied and experimented widely in the synthesis of igneous rocks. They showed that the same molten mixture yields rocks of different mineralogy, depending on the conditions of crystallization, and that the rate of cooling determines crystal size. Together they wrote Minéralogie micrographique: roches éruptives françaises, 2 vols. (1879; “Micrographic Mineralogy: French Igneous Rocks”) and Synthèse des minéraux et des roches (1882; “Synthesis of Minerals and Rocks”). With Alfred Lacroix he wrote Tableaux des minéraux des roches (1889) and Les Mineraux des roches (1888).
(Excerpt from Étude sur la Détermination des Feldspaths da...)
(This is a reproduction of a book published before 1923. T...)
French Academy of Sciences
