"Nickel\u2013Strunz classification is a scheme for categorizing minerals based upon their chemical composition, introduced by German mineralogist Karl Hugo Strunz (24 February 1910 \u2013 19 April 2006) in his Mineralogische Tabellen (1941). The 4th and the 5th edition was edited by Christel Tennyson too (1966). It was followed by A.S."@en .