Etymology: From Greek á (sfaledos) "treacherous", named in 1847.<ref name="Dana's new">Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: Dana's new mineralogy, John Wiley & Sons, 1997</ref><ref>James D. Dana: Dana's System of Mineralogy. Volume I, seventh edition, revised by Charles Palache, Harry Berman, and Clifford Frondel. John Wiley & Sons, 1944</ref>
- (mineralogy) A yellow, brown or black, sometimes red, green white or colorless mineral with cubic crystals, of a chemical formula (zinc, Zn,iron, Fe)sulfur, S.<ref name="Dana's new"/>
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