CLASSIFICATION OF IGNEOUS ROCKS 215 



WinchelP suggests the word auganite for olivine-free basalt, and 

 uses basalt for the olivine-bearing variety. The writer prefers 

 basalt and olivine-basalt for these rocks. 



According to their textures, basalts have been divided into three 

 groups: basalts proper, anamesite, and dolerite. 



Basalt proper. Compact, dense, aphanitic. 



Anamesite von Leonhard." Megascopically crystal- 

 line, but fine-grained. Name derived from dz^a/xecros, ''in the 

 middle." 



Dolerite Hauy,^ from SoXepos, "deceptive." Coarse- 

 grained. 



Alboranite Becke. Becke'' proposed the term albora- 

 nite for certain extrusive rocks from the island of Alboran. They 

 consist of hypersthene and basic plagioclase. The phenocrysts 

 in the rocks described by him are anorthite and the groundmass 

 microlites labradorite. The rocks thus are olivine-free hypersthene- 

 basalts, and, as extrusive representatives of norite, deserve the 

 new name. See note under santorinite (2215). 

 (2323) Kulaite Washington. This term was originally applied 

 by Washington^ to certain extrusive rocks from the volcanoes of 

 Kula, in Lydia, Asia Minor, under the impression that they were 

 hornblende-basalts. Later they were shown by him^ to be 

 nephelite-bearing and to contain approximately equal amounts of 

 orthoclase and basic plagioclase. No plutonite of this composition 

 has yet been located among modes given in the literature; therefore 

 kulaite is temporarily used as the family name. The term should 

 not be confused with kullait Hennig. 



'Alexander N. Winchell, "Rock Classification on Three Co-ordinates," Jour. 

 GeoL, XXI (1913), 215; also "Geology of the National Mining District, Nevada,"' 

 Mining and Scientific Press, CV (191 2), 657. 



^ Karl Casar von Leonhard, Die Basalt-Gebilde in ihren Beziehungcn zu normalen 

 und abnormen Felsmassen (Stuttgart, 1832), I, 151. 



3 Ascribed to Haiiy by Alexandre Brongniart, Classification et caracteres mineralo- 

 giques des roches (Paris, 1827), p. loi. 



'' F. Becke, "Der H>'persthen-Andesit der Insel x\lboran," Tscherm. Min Petr. 

 Miith., XVIII (1S99), 553. 



s Henry S. Washington, "On the Basalts of Kula," Amer. Jour. Sci., XL VII 

 (1894), 115. 



^ Ibid., "The Composition of Kulaite," Jour. GeoL, VIII (1900), 618. 



