Auguste Michel-Lévy

Template:Short description Template:Use dmy dates Template:Infobox scientistAuguste Michel-Lévy (7 August 1844Template:Snd27 September 1911) was a French geologist. He was born in Paris.

Biography

He became inspector-general of mines, and director of the Geological Survey of France. He was distinguished for his researches on extrusive rocks and their microscopic structure and origins. He employed the polarizing microscope early on for the identification of minerals.<ref name=AN>Auguste MICHEL-LEVY (1844–1911) Annales.org</ref> In his many contributions to scientific journals he described the granulite group, and dealt with pegmatites, variolites, eurites, the ophites of the Pyrenees,<ref>Further Contributions to the Geology of the Sierra Nevada by Henry Ward Turner</ref> the extinct volcanoes of Central France, gneisses, and crystalline schists.<ref name="EB1911">{{#if: |

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He wrote "Structures et classification des roches éruptives" (1889), but his more elaborate studies were carried out with Ferdinand André Fouqué.<ref name=AN/> Together they wrote on the artificial production of feldspar, nepheline and other minerals, and also of meteorites, and produced "Minéralogie micrographique: roches éruptives françaises" (1879) and "Synthése des minéraux et des roches" (1882). Levy also collaborated with Alfred Lacroix in "Les Minéraux des roches" (1888) and "Tableau des minéraux des roches" (1889).<ref name="EB1911"/><ref>Tableaux Des Minéraux Des Roches Template:Webarchive Rare Mineralogy Book: Michel-Lévy, Auguste</ref>

Michel-Lévy interference colour chart issued by Zeiss Microscopy

Michel-Lévy pioneered the use of birefringence to identify minerals in thin section with a petrographic microscope. He is widely known for the Michel-Lévy interference colour chart, which defines the interference colors from different orders of birefringence.

He also created classification schemes for igneous rocks which accounted for their mineralogy, texture, and composition, and showed that igneous rocks of different mineralogies could be formed from the same chemical composition, with different conditions of crystallization.<ref name=AN/> He named "esterellite" to the blue porphyry of Estérel in 1896.<ref>Template:Cite journal</ref><ref>Template:Cite book</ref>

External links

• Modern Microscopy, Michel-Lévy Interference Color Chart
• Molecular Expressions Microscopy Primer, Michel-Lévy Birefringence Chart
• Nikon Microscopy U, Michel-Lévy Birefringence Chart
• Olympus Microscopy Resource Center Template:Webarchive, Michel-Lévy Birefringence Chart
• Carl Zeiss Microscopy, Michel-Lévy Color Chart.