Petrological Abstracts and Reviews 



ALBERT JOHANNSEN 



Abend anon, E. C. Considerations sur la composition chimique et 

 mineralogique des roches eruptives, leur classification et leur 

 nomenclature. La Haye, 1913. Pp. 34. 



Andersen, Olaf. "The System Anorthite-Forsterite-Silica," 

 Amer. Jour. Sci., XXXIX (1915), 407-54. 

 A description and discussion of experimental methods used, and 

 results obtained, by fusing quartz, alumina, calcium carbonate, and 

 magnesia. Solid phases of anorthite, forsterite, cristobalite, tridymite, 

 clino-enstatite, and spinel were observed, and their thermal and optical 

 properties determined. Anorthite and silica form a simple eutectic 

 system, forsterite and silica form a system with an unstable compound, 

 while anorthite and forsterite form no true binary system. The appli- 

 cation of the results to igneous rocks is pointed out. 



Arschinow, W. W. On Inclusions of Anthraxolite {Anthracite) 

 in Igneous Rocks of Crimea. Petrographical Institute "Litho- 

 gaea," Publication No. 4. Moscow, 1914. Pp. 15. (In 

 Russian language.) 

 The term anthraxolite, originally proposed by Chapman for anthra- 

 cite found associated with quartz and pyrite in certain veins in the Lake 

 Superior region, is used by Arschinow for all bituminous substances. 

 Such substances occur in the form of small, black inclusions in igneous 

 rocks in two places on the southern shore of the Crimea. Since it also 

 occurs as vein and cavity fillings in the rock, and in many cases is asso- 

 ciated with calcite and quartz, it was probably formed, after the cooling 

 of the magma, by the destructive distillation of bituminous substances 

 disseminated in the stratified rocks. 



Ball, Sydney H., and Shaler, Millard K. "Contribution 



a l'etude geologique de la partie centrale du Congo beige y 



compris la region du Kasai," Ann. soc. geol. Belgique, 1913, 



199-247, map 1, pi. 3. 



The writers found diabase, granite, diorite-gneiss, granitoid-gneiss, 



chlorite-schist, and amphibole-gneiss in this region. 



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