Achille Ernest Oscar Joseph Delesse (1817-1881), French geologist and mineralogist, was born at Metz on 3 February 1817. At the age of twenty he entered the Ecole Polytechnique, and subsequently passed through the Ecole des Mines. 1817 was a common year starting on Wednesday (see link for calendar). ... 1881 was a common year starting on Saturday (see link for calendar). ... A geologist is a contributor to the science of geology. ... Mineralogy is an earth science that involves the chemistry, crystal structure, and physical (including optical) properties of minerals. ... City motto: Si paix dedans, paix dehors (French: If peace inside, peace outside) City proper (commune) Région Lorraine Département Moselle (57) Mayor Jean-Marie Rausch Area 41. ... February 3 is the 34th day of the year in the Gregorian Calendar. ... For other Écoles Polytechniques, see École Polytechnique de Montréal and École Polytechnique Fédérale de Lausanne. ... The École nationale supérieure des Mines de Paris (also known as École des Mines de Paris, ENSMP, les Mines, Mines Paris) is one of the French generalist and most prominent engineering Grandes Ecoles. ...

In 1845 he was appointed to the chair of mineralogy and geology at Besançon; in 1850 to the chair of geology at the Sorbonne in Paris; and in 1864 professor of agriculture at the Ecole des Mines. In 1878 he became inspector-general of mines. 1845 was a common year starting on Wednesday (see link for calendar). ... Mineralogy is an earth science that involves the chemistry, crystal structure, and physical (including optical) properties of minerals. ... Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... Location within France Besançon is a French city in the département of Doubs, of which it is the préfecture. ... 1850 was a common year starting on Tuesday (see link for calendar). ... The Sorbonne, Paris, in a 17th century engraving The Sorbonne today, from the same point of view The Sorbonne is frequently used in ordinary parlance as synonymous with the faculty of theology of Paris or the University of Paris in its entirety. ... The Eiffel Tower has become the symbol of Paris throughout the world. ... 1864 was a leap year starting on Friday (see link for calendar). ... 1878 was a common year starting on Tuesday (see link for calendar). ...

In early years as ingénieur des mines he investigated and described various new minerals; he proceeded afterward to the study of rocks, devising new methods for their determination, and giving particular descriptions of melaphyre, arkose, porphyry, syenite, and others. The igneous rocks of the Vosges, and those of the Alps, Corsica, etc., and the subject of metamorphism occupied his attention. He also prepared in 1858 geological and hydrological maps of Paris, with reference to the underground water, similar maps of the départements of the Seine and Seine-et-Marne, and an agronomic map of the Seine-et-Marne (1880), in which he showed the relation that exists between the physical and chemical characters of the soil and the geological structure. This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... Sedimentary, volcanic, plutonic, metamorphic rock types of North America. ... Arkose is a kind of sandstone combining of quartz and with large amounts of feldspar. ... Porphyry (Greek Πορφύριος purple-clad) may refer to: Porphyry of Tyros (c. ... Syenite Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts. ... Volcanic rock on North America Plutonic rock on North America Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... Vosges is a French département, named after the Vosges mountain range. ... The West face of the Petit Dru above the Chamonix valley near the Mer de Glace. ... Capital Ajaccio Land area¹ 8,680 km² President of the Executive Council Ange Santini (UMP) (since 2004) Population   - Jan. ... Metamorphism can be defined as the mineralogical, chemical and crystallographic changes in a solid-state rock, i. ... 1858 is a common year starting on Friday. ... The départements (or departments) are administrative units of France, roughly analogous to British counties. ... This article is about the river in France. ... Seine-et-Marne is a French département, named after the Seine and the Marne rivers, and located in the ÃŽle-de-France région. ... 1880 was a leap year starting on Thursday (see link for calendar). ... Soil is unconsolidated rock particles mixed with organic matter from plant decay. ...

His annual Revue des progrès de géologie, undertaken with the assistance (1860-1865) of Auguste Laugel and afterwards (1865-1878) of Albert de Lapparent, was carried on from 1860 to 1880. His observations on the lithology of the deposits accumulated beneath the sea were of special interest and importance. His separate publications were: Recherches sur l'origine des roches (Paris, 1865); Étude sur le métamorphisme des roches (1869), Lithologie des mers de France et des mers principales du globe (2 vols. and atlas, 1871). 1860 is the leap year starting on Sunday. ... 1865 is a common year starting on Sunday. ... 1878 was a common year starting on Tuesday (see link for calendar). ... Petrology is a field of geology which focuses on the study of rocks and the conditions by which they form. ...

He died at Paris on 24 March 1881. March 24 is the 83rd day of the year in the Gregorian Calendar (84th in Leap years). ... 1881 was a common year starting on Saturday (see link for calendar). ...

References

• This article incorporates text from the 1911 Encyclopædia Britannica, which is in the public domain.