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rruff.info/index.php/r=lookup_minerals/letter=k/.../id_field=a b c d e f g h i j k l m n o p q r s t u v w x y z Bold - RRUFF samples.BoldItalic - other samples.Italic - pending samples.: k K3Fe(CN)5NO: Karupmollerite-Ca ...
enacademic.com/dic.nsf/enwiki/11818735Nickel–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 1941 Mineralogische Tabellen.  The 4th edition was edited by Christel Tennyson too (1966). It was followed by A.S. Povarennykh with a modified classification (1966 in Russian, 1972 in English).
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