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Published online by Cambridge University Press: 14 March 2018
Although zinekenite and wolfsbergite are to be considered as isomorphous, it seems to be as rare a thing to find simple crystals of zinekenite as it is to find twinned crystals of wolfsbergite. In the following note simple and twinned crystals of the two minerals respectively are described.
page 188 note 1 Ber. Akad. Wien. IX. 527, 1852.
page 188 note 2 Pogg. Ann. VII. 91, 1826.
page 189 note 1 The position of the crystals is that of Groth, Tab. Uebera. Min, 3rd. Ed. 1889, p. 28.
page 189 note 2 System of Mineralogy, 6th Ed. 1892, p. 112.
page 189 note 3 This form a {100} has been recorded by Kenngott (loc. cit.), but has beea previously overlooked.
page 189 note 4 Die Minerale des Harzes, Berlin, 1896, p. 123..
page 190 note 1 O. Luedeeke, loc. cit; Sehulze, E., Lithia Hereynica, Leipzig, 1895 Google Scholar.
page 190 note 2 The probable identity of wolfsberg;te and guejarite was pointed out in a paper read before this Society on April 14th, 1896 (see this volume, p. x.).
page 190 note 3 lndez der Krystallformen der Mineralien, 1891, III. p. 331.
page 191 note 1 Groth (Tab. Uebers. Min., 3rd Edit.) calculates from Welsbach's measurements a:b:c = 0.5385: 1: 0.6204. The above are as given by Dana (Min., 6th Edit.).
page 191 note 2 Laspeyres gives for wolfsbergite—a: b: c =0·52830: 1: 0·62339 (Zeits. f. Kryst. XIX. 428, 1891).
