He is best known as an editor of the ninth edition of the Nickel-Strunz classification together with Karl Hugo Strunz.
Nickel–Strunz classification is a scheme for categorizing minerals based upon their chemical composition, introduced by German mineralogist Karl Hugo Strunz (24 February 1910 – 19 April 2006) in his Mineralogische Tabellen (1941).
Karl Marx | Victor Hugo | Hugo Boss | Hugo | Karl Pilkington | Karl Lagerfeld | Karl G. Heider | Hugo Chávez | Karl Rove | Karl Pearson | Karl May | Karl Liebknecht | Karl Friedrich Schinkel | Karl Dönitz | Hugo Award | Karl Jenkins | Hugo Black | Karl Stefanovic | Hugo Weaving | Hugo Pratt | Hugo Grotius | Karl Bodmer | Hugo Claus | Karl Wilhelm Friedrich Schlegel | Karl Malone | Karl Wolf | Karl Valentin | Karl Popper | Karl Malden | Karl Kesel |