Francisite, Cu3Bi(SeO3)2O2Cl, a new mineral from Iron Monarch, South Australia: description and crystal structure

Allan Pring, Bryan M. Gatehouse, William D. Birch

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63 Citations (Scopus)


Francisite is a new copper bismuth oxy-chloro selenite from Iron Monarch, South Australia. The new mineral occurs as radiating clusters of bright green bladed crystals up to 0.25 mm in length. The crystals are elongated along [010], and the principal forms are {100}, {011}, and {101}. Associated with francisite are barite, chlorargyrite, muscovite, native bismuth, naumannite, djurleite, and a number of poorly characterized selenides of Bi, Ag, and Cu. Francisite appears to have formed as a result of hydrothermal alteration of the selenide and sulfide minerals. The simplified formula is close to Cu3Bi(SeO3)2O2Cl. The mineral is transparent and has a pale green streak. The estimated Mohs hardness is 3-4, and Dcalc = 5.42 gm/cm3. The crystal structure and the results of single crystal studies and X-ray powder diffraction are reported. -after Authors

Original languageEnglish
Pages (from-to)1421-1425
Number of pages5
JournalAmerican Mineralogist
Issue number11-12
Publication statusPublished - 1 Jan 1990
Externally publishedYes


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