Petrological Abstracts and Reviews 



Edited by ALBERT JOHANNSEN 



Allen, E. T., and Crenshaw, J. L. "The Mineral Sulphides of 

 Iron. With Crystallographic Study by Esper S. Larsen," 

 Amer. Jour. Sci., XXXIII (1912), 169-236. 



Allen, E. T., and Crenshaw, J. L. "The Sulphides of Zinc, 

 Cadmium, and Mercury; Their Crystalline Forms and 

 Genetic Conditions. Microscopic Study by H. E. Merwin," 

 Amer. Jour. Sci., XXXIV (1912), 341-96. 



Arsandaltx, H. "Sur la presence au Gabon de roches apparte- 



nantes a la serie de la charnockite," Comptes rendus de VAcad. 



d. Sci., Paris, CLIV (191 2), 896. 



In the Como Basin, a part of the French Congo, the author finds 



hypersthene granites, of a type hitherto found in but few localities, 



associated with ordinary granites and with amphibolite schists, gabbros, 



and diabases. Similar rocks of the charnockite family have been found 



on the Ivory Coast, about 1,000 miles northwest, but in that region the 



rocks found associated in the Como Basin characterize separate localities. 



F. C. Calkins 



Arschinow, W. W. Ueber zwei Feldspdthe aus dem Ural. Moskau, 

 1911. Pp. 12. 

 An article in the Russian language, with a German resume, describing 

 a potash-soda feldspar from the Ilmen, and an oligoclase-albite from the 

 South Urals. 



Arschinow, W. W. Zur Geologie der Halhinsel Krym., Moskau, 

 1910. Pp. 16. 

 An article in the Russian language, with a German resume, describing 

 a basalt tuff from the neighborhood of Balaklava. The rock consists of a 

 basic feldspar, of which an analysis is given, diopside, green hornblende, 

 magnetite, and rarely brown basaltic hornblende. The cementing 



