| Reference List: | Sowerby, J. (1809) British Mineralogy, or Coloured Figures Intended to Elucidate the Mineralogy of Great Britain. 5 volumes, London: 3: 5, fig. 203.
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 553.
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