Reference List:
- + | Forbes (1855), Ednburgh New Phil. Journal: 1: 67.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 757.
- Raade, G. (1996): Minerals originally described from Norway. Including notes on type material. Norsk Bergverksmuseum Skrift, 11, 104 pp. + plates 1-7
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