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).[1] The 4th and the 5th edition was also edited by Christel Tennyson (1966). It was followed by A.S. Povarennykh with a modified classification (1966 in Russian, 1972 in English).
As curator of the Mineralogical Museum of Friedrich-Wilhelms-Universität (now known as the Humboldt University of Berlin), Strunz had been tasked with sorting the museum's geological collection according to crystal-chemical properties.[1] His book Mineralogical Tables, has been through a number of modifications; the most recent edition, published in 2001, is the ninth (Mineralogical Tables by Hugo Strunz and Ernest H. Nickel (31 August 1925 – 18 July 2009)).[2][3] The IMA/CNMNC supports the Nickel–Strunz database.[4]
The Nickel–Strunz code scheme is NN.XY.##x, where:
The current scheme divides minerals into ten classes, which are further divided into divisions, families and groups according to chemical composition and crystal structure.[5]
IMA/CNMNC proposes a new hierarchical scheme (Mills et al. 2009), using the Nickel–Strunz classes (10 ed) this gives:
Media related to Nickel–Strunz classification at Wikimedia Commons| "Special cases" ("native elements and organic minerals") |
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| "Sulfides and oxides" |
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| "Evaporites and similars" |
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| "Mineral structures with tetrahedral units" (sulfate anion, phosphate anion, silicon, etc.) |
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