Friedrich Mohs (January 29, 1773 - September 29, 1839) was a German geologist/mineralogist. January 29 is the 29th day of the year in the Gregorian Calendar. ... 1773 was a common year starting on Friday (see link for calendar). ... September 29 is the 272nd day of the year (273rd in leap years). ... 1839 was a common year starting on Tuesday (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. ...

Mohs, born in Gernrode, Germany, studied chemistry, mathematics and physics at the University of Halle and also studied at the Mining Academy in Freiberg, Saxony. After assuming the position of a foreman at a mine in 1801, Mohs moved in 1802 to Austria, where he was employed in trying to identify the minerals in a private collection of a Banker. As part of this task, he started classifying minerals by their physical characteristics, in spite of their chemical composition, as had been was done traditionally. This article is a rough translation of an article in German. ... Chemistry (in Greek: χημεία) is the science of matter and its interactions with energy and itself (see physics, biology). ... Mathematics is the study of quantity, structure, space and change. ... When stuff moves. ... The Martin-Luther-University of Halle-Wittenberg is located in the German cities of Halle, Saxony-Anhalt and Wittenberg. ... With an area of 18,413 km² and a population of 4. ... The El Chino Mine located near Silver City, New Mexico is an open-pit copper mine Mining is the extraction of valuable minerals or other geological materials from the earth, usually (but not always) from an ore body, vein, or (coal) seam. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ...

This emphasis on physical characteristics was at odds with the prevailing chemical systematics. Minerals are now classified by chemical characteristics, but the physical properties are still useful in field examination.

In 1812, Mohs became professor in Graz; in 1818, professor in Freiberg, Saxony; in 1826, professor in Vienna. He created a hardness scale that is still used as Mohs scale of mineral hardness. Graz [graːts] (Slovenian: Gradec, pronounced grah-dets), with a population of 305,000 (council census 2000) is the second-largest city in Austria and the capital of the federal state of Styria (Steiermark in German). ... Freiberg, Obermarkt square Freiberg is a city in Saxony, Germany, capital of the district Freiberg. ... View of Vienna This article is about the city and federal state in Austria. ... In materials science, hardness is the characteristic of a solid material expressing its resistance to permanent deformation. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ...

Mohs died during a trip to Italy in Agordo near Belluno. Belluno is the capital of the Belluno Province of Italy. ...