| Becke, Friedrich, Prof. born 31st December 1855, Prague, died 18th June 1931, Vienna Austrian mineralogist, petrographer, and teacher. He studied at the Vienna University and in 1876 became assistant professor of mineralogy with professor G. Tschermak. Later he lectured as professor at the University in Černovice, region of Bukovina, at the German University in Prague, and then at the Vienna University. He concentrated on crystallography (methods of microscopic determination of rock-forming minerals, especially feldspars, using the index of refraction - the so-called 'Becke line') and mineralogy. Later he studied petrography of gneisses of the Hrubý Jeseník Mountains,1892, Moldanubicum of Waldviertel, and the Eastern Alps, then igneous rocks of the České středohoří Mountains (he described the theralite of Doupov). He was also interested in the investigation of the alpine crystalline rocks. He studied and described the uranium minerals from Jáchymov. He edited the periodical 'Tschermak´s Mineralogische und petrographische Mitteilungen'. He was a pioneer of microscopic studies of metamorphic rocks.
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