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Published online by Cambridge University Press: 14 March 2018
This rare mineral, the Dufrenoysite of yon Waltershausen and others, crystallising in the cubical system, has been made the subject of careful investigation by several observers, with the result that, up to the present moment, it is doubtful whether the character of its forms is holohedral or hemihedral with inclined faces. Hessenberg found that the mineral crystallised holohedrally, but Groth, confirming Kenngott's view, states that the best crystal in the Strassburg University collection shows a distinctly hemihedral development.
page 220 note 1 Mineralog. Notizen, Heft. IX., 1875, p. 6. Abhandl. d. Senckenberg. Naturforsch. Gesellsch. in Frankf., Bd. X.
page 220 note 2 Mineralicn Sammlung d. Univ. Strassburg, 1878, p. 59.
page 220 note 3 Uebers. Min. Forsch., 1856, u. 57. Die Minerale der Schweiz, 1866, p. 378.
page 220 note 4 Proceed. Crystallog. Soc. II,, 53, 1877, and Zeitschr. f. Kryst. II., 192, 1878.
page 221 note 1 G. veto Ruth, Ueber d, Mineral. Funastätte des Binnenthals Pogg. Ann, 122, p. B95,
page 222 note 1 Compare: H. A. Miers, Contributions to the study of Pyrargyrite and Proustite, Min. Mag . VIII., 87.
page 228 note 1 Bihang t. svenska vel.-Akad. Handl., 1887, Vol. 13, and Zeitschr. f, Kryst. XV., 84,