- (mineralogy) A mineral form of silver sulfide, Ag2S, that is a major ore of silver, that forms slender prisms.
- ^ 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
- ^ Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: Dana's new mineralogy, John Wiley & Sons, 1997
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