Formula:K(Al,Cr)3Si3O10(OH)2Name:Named in 1842 by Karl F. Emil von Schafhäutl in honour of Johann Nepomuk von Fuchs [May 15, 1774 Mattenzell, near Bremberg, Lower Bavaria, Germany - March 5, 1856 Munich, Germany] professor of chemistry and mineralogy at University of Landshut and curator of the mineral collection.