NO. 1801. MISCELLANEOUS MINERALOGIGAL PAPERS— POOUE. 579 



blende at Dognacska, Hungary. In 1878 Ain Barber, Algiers, was 

 cited by Groth'^ as an additional locality, and the accounts of Rumpf, 

 Reuss, and Weinek were summarized by Blum.^ Lacroix,*' in 1897, 

 gave an account of marcasite from Pontpean, near Rennes, Ille-et- 

 Vilaine, France, describing thin hexagonal plates, with occasional 

 pyramidal habit, as pseudomorphs after pyrrhotite. The same year 

 Miers '^ mentioned a specimen from Cornwall, England, comprising a 

 low hexagonal pyramid, the material of which "appeared to be mar- 

 casite." And, finally, Pojana, Siebenburgen, was added by Hintze « 

 as a further locality. 



EXPLANATIONS OF PLATES. 



Plate 63. 



Figs. 1-3. — Crystals of calamine from Chihuahua, Mexico. Orthographic and clino- 

 graphic projections. Enlarged. 

 4. — Biotite-phlogopite intergrowth from Ottawa, Canada. Natiu-al size. 

 Clinographic projection, with orthographic plan of upper and lower 

 basal planes. The stippled portion is biotite; the white, phlogopite. 

 5-6.— Pseudomorphs of marcasite after pyrrhotite from Osnabruck, Prussia. 

 Clinographic projection. Enlarged. 



For the significance of the lettering on the figures see text. 



Plate 64. 



Pseudomorphs of marcasite after pyrrhotite from Osnabruck, Prussia. About 

 twice natural size. 



«P. Groth. Die Mineraliensammlung. Strassbin-g, 1878, p. 45. 



^ J. R. Blum. Pseudomorphosen des Mineralreichs. 4 Nachtrag, 1879, p. 105. 



c A . Lacroix. Sur la marcasite de Pontpean (Ille-et-Vilaine) et sur les pseudomorphes 

 qu'elle constitue. Compt. rend., vol. 125, 1897, pp. 265, 267; Bull. Soc. Min. France, 

 vol. 20, 1897, pp. 223-232. 



dB.. A. Miers. On some British pseudomorphs. Min. Mag., vol. 11, 1897, pp. 263-285. 



«C. Hintze. Handbuch der Mineralogie. Leipzig, vol. 1, 1904, p. 827. 



