﻿THE 



AMERICAN JOURNAL OF SCIENCE. 



[THIRD SERIES.] 



Art. XLYIII. — On the Crystallization of Native Copper ; by 

 Edward S. Dana. With Plates X to XIII. 



Literature. 



Hauy, Traite de Mineralogie, iii, 425, 1822. Mohs, Mineralogie, ii, 519, 1822 

 Haidinger, Kdinb. Jouru. Science, i, 58, 1826. G. Rose. Reise naeh dem Ural, 

 vol. i, 313, 40] ; ii, 453, 183*7. Levy, Description d'une Collection de Mineraux 

 formee par M. Henri Heuland, vol. iii, I and Atlas, plate lix. Haidinger, Sitz- 

 ungsber. Akad. Wien, xlviii, 6, 1863. Schrauf, Mineral ogische Mittheilungen, 

 1872, 53 ; 1873, 290. Zerrenner, ibid., 1874, 94. N. VON Kokscharow, 

 Materialien zur Mineralogie Russlands, vi, 209. G. Seligmann, Verhandl. 

 naturhist. Ver. Rheinl., xxxiii, 261, 187 6. P. von Jeremejew, Zs. Kryst., i, 398, 

 187*7. G. vom Rath, Zs. Kryst., ii, 169. 1878. L. Fletcher, Phil. Mag., Y, ix, 

 180, 1880. A. von Lasaulx, Sitzungsber. Niederrhein, Ges., Bonn, July 3, 1882. 

 K. von Foullon, Jahrb. k. k. geol. Reichsanstalt, xxxiii, 1883. W. G. Brown, 

 this Journal, xxxii, 377, November, 1886. 



Historical summary. — The early writers give but little infor- 

 mation about the crystallization of native copper. Hauy, 

 and Mohs (1822) figure only the simple crystals showing the 

 combination of the cube, octahedron and dodecahedron. Haiiy, 

 however, speaks of a crystal consisting of a low hexagonal 

 pyramid with a short hexagonal prism, which seems to be the 

 same form described by Haidinger in 1824. This latter crystal 

 was from the Nalso, and showed the tetrahexahedron e (210, i-2) 

 shortened in the direction of an octahedral axis and probably 

 twinned parallel to the octahedral plane normal to this axis 

 (compare figures 20, 21, Plate XI). 



Am. Jour. Sol— THiRr Series, Vol. XXXII, No. 192. — December, 1886. 

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